diff --git a/src/lib.rs b/src/lib.rs
index c8805a8..49ac8cc 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -18,7 +18,7 @@ struct ArgCountErr {
 }
 
 struct ArgTypeErr {
-    expected: OscType,
+    expected: Vec<OscType>,
     actual: OscType,
     addr: String,
     arg_count: usize,
@@ -89,7 +89,7 @@ impl MessageBehavior for VmcExtOk {
                     result.loaded = i;
                 }
                 _ => {
-                    return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Int(0), actual: msg.args[0],addr: msg.addr.to_owned(), arg_count: 0}));
+                    return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Int(0)], actual: msg.args[0],addr: msg.addr.to_owned(), arg_count: 0}));
                 }
             }
         } else {
@@ -101,7 +101,7 @@ impl MessageBehavior for VmcExtOk {
                     result.calibration_state = Some(i);
                 }
                 _ => {
-                    return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Int(0), actual: msg.args[1], addr: msg.addr.to_owned(), arg_count: 1}));
+                    return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Int(0)], actual: msg.args[1], addr: msg.addr.to_owned(), arg_count: 1}));
                 }
             }
             match msg.args[2] {
@@ -109,7 +109,7 @@ impl MessageBehavior for VmcExtOk {
                     result.calibration_mode = Some(i);
                 }
                 _ => {
-                    return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Int(0), actual: msg.args[2], addr: msg.addr.to_owned(), arg_count: 2}));
+                    return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Int(0)], actual: msg.args[2], addr: msg.addr.to_owned(), arg_count: 2}));
                 }
             }
         }
@@ -119,7 +119,7 @@ impl MessageBehavior for VmcExtOk {
                     result.tracking_status = Some(i);
                 }
                 _ => {
-                    return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Int(0), actual: msg.args[3], addr: msg.addr.to_owned(), arg_count: 3}));
+                    return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Int(0)], actual: msg.args[3], addr: msg.addr.to_owned(), arg_count: 3}));
                 }
             }
         }
@@ -144,7 +144,7 @@ impl MessageBehavior for VmcExtT {
         }
         match msg.args[0] {
             OscType::Float(f) => return Ok(VmcExtT { time: f }),
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Float(0.0), actual: msg.args[0], addr: msg.addr, arg_count: 0})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Float(0.0)], actual: msg.args[0], addr: msg.addr, arg_count: 0})),
         }
     }
 }
@@ -189,19 +189,19 @@ impl MessageBehavior for VmcExtRootPos {
             let name: String;
             match &msg.args[0] {
                 OscType::String(s) => name = s.to_owned(),
-                _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::String(String::new()), actual: msg.args[0], addr: msg.addr, arg_count: 0})),
+                _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::String(String::new())], actual: msg.args[0], addr: msg.addr, arg_count: 0})),
             }
             match msg.args[1] {
                 OscType::Float(f) => origin.x = f,
-                _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Float(0.0), actual: msg.args[1], addr: msg.addr, arg_count: 1})),
+                _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Float(0.0)], actual: msg.args[1], addr: msg.addr, arg_count: 1})),
             }
             match msg.args[2] {
                 OscType::Float(f) => origin.y = f,
-                _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Float(0.0), actual: msg.args[2], addr: msg.addr, arg_count: 2})),
+                _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Float(0.0)], actual: msg.args[2], addr: msg.addr, arg_count: 2})),
             }
             match msg.args[3] {
                 OscType::Float(f) => origin.z = f,
-                _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Float(0.0), actual: msg.args[3], addr: msg.addr, arg_count: 3})),
+                _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Float(0.0)], actual: msg.args[3], addr: msg.addr, arg_count: 3})),
             }
             let mut quat = Quaternion {
                 x: 0.0,
@@ -211,19 +211,19 @@ impl MessageBehavior for VmcExtRootPos {
             };
             match msg.args[4] {
                 OscType::Float(f) => quat.x = f,
-                _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Float(0.0), actual: msg.args[4], addr: msg.addr, arg_count: 4})),
+                _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Float(0.0)], actual: msg.args[4], addr: msg.addr, arg_count: 4})),
             }
             match msg.args[5] {
                 OscType::Float(f) => quat.y = f,
-                _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Float(0.0), actual: msg.args[5], addr: msg.addr, arg_count: 5})),
+                _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Float(0.0)], actual: msg.args[5], addr: msg.addr, arg_count: 5})),
             }
             match msg.args[6] {
                 OscType::Float(f) => quat.z = f,
-                _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Float(0.0), actual: msg.args[6], addr: msg.addr, arg_count: 6})),
+                _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Float(0.0)], actual: msg.args[6], addr: msg.addr, arg_count: 6})),
             }
             match msg.args[7] {
                 OscType::Float(f) => quat.w = f,
-                _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Float(0.0), actual: msg.args[7], addr: msg.addr, arg_count: 7})),
+                _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Float(0.0)], actual: msg.args[7], addr: msg.addr, arg_count: 7})),
             }
             result = VmcExtRootPos {
                 name,
@@ -247,27 +247,27 @@ impl MessageBehavior for VmcExtRootPos {
             });
             match msg.args[8] {
                 OscType::Float(f) => result.mr_scale.unwrap().x = f,
-                _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Float(0.0), actual: msg.args[8], addr: msg.addr, arg_count: 8})),
+                _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Float(0.0)], actual: msg.args[8], addr: msg.addr, arg_count: 8})),
             }
             match msg.args[9] {
                 OscType::Float(f) => result.mr_scale.unwrap().y = f,
-                _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Float(0.0), actual: msg.args[9], addr: msg.addr, arg_count: 9})),
+                _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Float(0.0)], actual: msg.args[9], addr: msg.addr, arg_count: 9})),
             }
             match msg.args[10] {
                 OscType::Float(f) => result.mr_scale.unwrap().z = f,
-                _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Float(0.0), actual: msg.args[10], addr: msg.addr, arg_count: 10})),
+                _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Float(0.0)], actual: msg.args[10], addr: msg.addr, arg_count: 10})),
             }
             match msg.args[11] {
                 OscType::Float(f) => result.mr_offset.unwrap().x = f,
-                _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Float(0.0), actual: msg.args[11], addr: msg.addr, arg_count: 11})),
+                _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Float(0.0)], actual: msg.args[11], addr: msg.addr, arg_count: 11})),
             }
             match msg.args[12] {
                 OscType::Float(f) => result.mr_offset.unwrap().y = f,
-                _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Float(0.0), actual: msg.args[12], addr: msg.addr, arg_count: 12})),
+                _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Float(0.0)], actual: msg.args[12], addr: msg.addr, arg_count: 12})),
             }
             match msg.args[13] {
                 OscType::Float(f) => result.mr_offset.unwrap().z = f,
-                _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Float(0.0), actual: msg.args[13], addr: msg.addr, arg_count: 13})),
+                _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Float(0.0)], actual: msg.args[13], addr: msg.addr, arg_count: 13})),
             }
         }
         return Ok(result);
@@ -304,19 +304,19 @@ impl MessageBehavior for VmcExtBonePos {
         }
         match &msg.args[0] {
             OscType::String(s) => name = s.to_owned(),
-                _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::String(String::new()), actual: msg.args[0], addr: msg.addr, arg_count: 0})),
+                _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::String(String::new())], actual: msg.args[0], addr: msg.addr, arg_count: 0})),
         }
         match msg.args[1] {
             OscType::Float(f) => origin.x = f,
-                _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Float(0.0), actual: msg.args[1], addr: msg.addr, arg_count: 1})),
+                _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Float(0.0)], actual: msg.args[1], addr: msg.addr, arg_count: 1})),
         }
         match msg.args[2] {
             OscType::Float(f) => origin.y = f,
-                _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Float(0.0), actual: msg.args[2], addr: msg.addr, arg_count: 2})),
+                _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Float(0.0)], actual: msg.args[2], addr: msg.addr, arg_count: 2})),
         }
         match msg.args[3] {
             OscType::Float(f) => origin.z = f,
-                _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Float(0.0), actual: msg.args[3], addr: msg.addr, arg_count: 3})),
+                _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Float(0.0)], actual: msg.args[3], addr: msg.addr, arg_count: 3})),
         }
         let mut quat = Quaternion {
             x: 0.0,
@@ -326,19 +326,19 @@ impl MessageBehavior for VmcExtBonePos {
         };
         match msg.args[4] {
             OscType::Float(f) => quat.x = f,
-                _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Float(0.0), actual: msg.args[4], addr: msg.addr, arg_count: 4})),
+                _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Float(0.0)], actual: msg.args[4], addr: msg.addr, arg_count: 4})),
         }
         match msg.args[5] {
             OscType::Float(f) => quat.y = f,
-                _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Float(0.0), actual: msg.args[5], addr: msg.addr, arg_count: 5})),
+                _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Float(0.0)], actual: msg.args[5], addr: msg.addr, arg_count: 5})),
         }
         match msg.args[6] {
             OscType::Float(f) => quat.z = f,
-                _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Float(0.0), actual: msg.args[6], addr: msg.addr, arg_count: 6})),
+                _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Float(0.0)], actual: msg.args[6], addr: msg.addr, arg_count: 6})),
         }
         match msg.args[7] {
             OscType::Float(f) => quat.w = f,
-                _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Float(0.0), actual: msg.args[7], addr: msg.addr, arg_count: 7})),
+                _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Float(0.0)], actual: msg.args[7], addr: msg.addr, arg_count: 7})),
         }
         return Ok(VmcExtBonePos {
             name,
@@ -370,11 +370,11 @@ impl MessageBehavior for VmcExtBlendVal {
         }
         match &msg.args[0] {
             OscType::String(s) => name = s.to_owned(),
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::String(String::new()), actual: msg.args[0], addr: msg.addr, arg_count: 0})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::String(String::new())], actual: msg.args[0], addr: msg.addr, arg_count: 0})),
         }
         match msg.args[1] {
             OscType::Float(f) => value = f,
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Float(0.0), actual: msg.args[1], addr: msg.addr, arg_count: 1})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Float(0.0)], actual: msg.args[1], addr: msg.addr, arg_count: 1})),
         }
         return Ok(VmcExtBlendVal { name, value });
     }
@@ -414,39 +414,39 @@ impl MessageBehavior for VmcExtCam {
         let fov: f32;
         match &msg.args[0] {
             OscType::String(s) => name = s.to_owned(),
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::String(String::new()), actual: msg.args[0], addr: msg.addr, arg_count: 0})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::String(String::new())], actual: msg.args[0], addr: msg.addr, arg_count: 0})),
         }
         match msg.args[1] {
             OscType::Float(f) => origin.x = f,
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Float(0.0), actual: msg.args[1], addr: msg.addr, arg_count: 1})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Float(0.0)], actual: msg.args[1], addr: msg.addr, arg_count: 1})),
         }
         match msg.args[2] {
             OscType::Float(f) => origin.y = f,
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Float(0.0), actual: msg.args[2], addr: msg.addr, arg_count: 2})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Float(0.0)], actual: msg.args[2], addr: msg.addr, arg_count: 2})),
         }
         match msg.args[3] {
             OscType::Float(f) => origin.z = f,
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Float(0.0), actual: msg.args[3], addr: msg.addr, arg_count: 3})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Float(0.0)], actual: msg.args[3], addr: msg.addr, arg_count: 3})),
         }
         match msg.args[4] {
             OscType::Float(f) => quat.x = f,
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Float(0.0), actual: msg.args[4], addr: msg.addr, arg_count: 4})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Float(0.0)], actual: msg.args[4], addr: msg.addr, arg_count: 4})),
         }
         match msg.args[5] {
             OscType::Float(f) => quat.y = f,
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Float(0.0), actual: msg.args[5], addr: msg.addr, arg_count: 5})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Float(0.0)], actual: msg.args[5], addr: msg.addr, arg_count: 5})),
         }
         match msg.args[6] {
             OscType::Float(f) => quat.z = f,
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Float(0.0), actual: msg.args[6], addr: msg.addr, arg_count: 6})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Float(0.0)], actual: msg.args[6], addr: msg.addr, arg_count: 6})),
         }
         match msg.args[7] {
             OscType::Float(f) => quat.w = f,
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Float(0.0), actual: msg.args[7], addr: msg.addr, arg_count: 7})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Float(0.0)], actual: msg.args[7], addr: msg.addr, arg_count: 7})),
         }
         match msg.args[8] {
             OscType::Float(f) => fov = f,
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Float(0.0), actual: msg.args[8], addr: msg.addr, arg_count: 8})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Float(0.0)], actual: msg.args[8], addr: msg.addr, arg_count: 8})),
         }
         return Ok(VmcExtCam {
             name,
@@ -490,40 +490,40 @@ impl MessageBehavior for VmcExtCon {
         let mut axis = Vector3::new(0.0, 0.0, 0.0);
         match msg.args[0] {
             OscType::Int(i) => active = i,
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Int(0), actual: msg.args[0], addr: msg.addr, arg_count: 0})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Int(0)], actual: msg.args[0], addr: msg.addr, arg_count: 0})),
         }
         if active > 2 || active < 0 {
             return Err(FromMessageErr::IntRange(IntRangeErr { expected_lower: 0, expected_upper: 2, actual: active, addr: msg.addr, arg_count: 0}));
         }
         match &msg.args[1] {
             OscType::String(s) => name = s.to_owned(),
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::String(String::new()), actual: msg.args[1], addr: msg.addr, arg_count: 1})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::String(String::new())], actual: msg.args[1], addr: msg.addr, arg_count: 1})),
         }
         match msg.args[2] {
             OscType::Int(i) => is_left = i,
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Int(0), actual: msg.args[2], addr: msg.addr, arg_count: 2})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Int(0)], actual: msg.args[2], addr: msg.addr, arg_count: 2})),
         }
         if is_left < 0 || is_left > 1 {
             return Err(FromMessageErr::IntRange(IntRangeErr { expected_lower: 0, expected_upper: 1, actual: active, addr: msg.addr, arg_count: 2}));
         }
         match msg.args[3] {
             OscType::Int(i) => is_touch = i,
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Int(0), actual: msg.args[3], addr: msg.addr, arg_count: 3})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Int(0)], actual: msg.args[3], addr: msg.addr, arg_count: 3})),
         }
         if is_touch < 0 || is_touch > 1 {
             return Err(FromMessageErr::IntRange(IntRangeErr { expected_lower: 0, expected_upper: 1, actual: active, addr: msg.addr, arg_count: 3}));
         }
         match msg.args[4] {
             OscType::Float(f) => axis.x = f,
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Float(0.0), actual: msg.args[4], addr: msg.addr, arg_count: 4})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Float(0.0)], actual: msg.args[4], addr: msg.addr, arg_count: 4})),
         }
         match msg.args[5] {
             OscType::Float(f) => axis.y = f,
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Float(0.0), actual: msg.args[5], addr: msg.addr, arg_count: 5})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Float(0.0)], actual: msg.args[5], addr: msg.addr, arg_count: 5})),
         }
         match msg.args[6] {
             OscType::Float(f) => axis.z = f,
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Float(0.0), actual: msg.args[6], addr: msg.addr, arg_count: 6})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Float(0.0)], actual: msg.args[6], addr: msg.addr, arg_count: 6})),
         }
         return Ok(VmcExtCon {
             active,
@@ -575,15 +575,15 @@ impl MessageBehavior for VmcExtKey {
                     return Err(FromMessageErr::IntRange(IntRangeErr { expected_lower: 0, expected_upper: 1, actual: i, addr: msg.addr, arg_count: 0}));
                 }
             }
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Int(0), actual: msg.args[0], addr: msg.addr, arg_count: 0})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Int(0)], actual: msg.args[0], addr: msg.addr, arg_count: 0})),
         }
         match &msg.args[1] {
             OscType::String(s) => name = s.to_owned(),
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::String(String::new()), actual: msg.args[1], addr: msg.addr, arg_count: 1})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::String(String::new())], actual: msg.args[1], addr: msg.addr, arg_count: 1})),
         }
         match msg.args[2] {
             OscType::Int(i) => keycode = i,
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Int(0), actual: msg.args[2], addr: msg.addr, arg_count: 2})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Int(0)], actual: msg.args[2], addr: msg.addr, arg_count: 2})),
         }
         return Ok(VmcExtKey {
             active,
@@ -636,19 +636,19 @@ impl MessageBehavior for VmcExtMidiNote {
                     return Err(FromMessageErr::IntRange(IntRangeErr { expected_lower: 0, expected_upper: 1, actual: i, addr: msg.addr, arg_count: 0}));
                 }
             }
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Int(0), actual: msg.args[0], addr: msg.addr, arg_count: 0})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Int(0)], actual: msg.args[0], addr: msg.addr, arg_count: 0})),
         }
         match msg.args[1] {
             OscType::Int(i) => channel = i,
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Int(0), actual: msg.args[1], addr: msg.addr, arg_count: 1})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Int(0)], actual: msg.args[1], addr: msg.addr, arg_count: 1})),
         }
         match msg.args[2] {
             OscType::Int(i) => note = i,
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Int(0), actual: msg.args[2], addr: msg.addr, arg_count: 2})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Int(0)], actual: msg.args[2], addr: msg.addr, arg_count: 2})),
         }
         match msg.args[3] {
             OscType::Float(f) => velocity = f,
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Float(0.0), actual: msg.args[3], addr: msg.addr, arg_count: 3})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Float(0.0)], actual: msg.args[3], addr: msg.addr, arg_count: 3})),
         }
         return Ok(VmcExtMidiNote {
             active,
@@ -679,11 +679,11 @@ impl MessageBehavior for VmcExtMidiCcVal {
         let value: f32;
         match msg.args[0] {
             OscType::Int(i) => knob = i,
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Int(0), actual: msg.args[0], addr: msg.addr, arg_count: 0})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Int(0)], actual: msg.args[0], addr: msg.addr, arg_count: 0})),
         }
         match msg.args[1] {
             OscType::Float(f) => value = f,
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Float(0.0), actual: msg.args[1], addr: msg.addr, arg_count: 1})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Float(0.0)], actual: msg.args[1], addr: msg.addr, arg_count: 1})),
         }
         return Ok(VmcExtMidiCcVal { knob, value });
     }
@@ -715,7 +715,7 @@ impl MessageBehavior for VmcExtMidiCcBit {
         let active: bool;
         match msg.args[0] {
             OscType::Int(i) => knob = i,
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Int(0), actual: msg.args[0], addr: msg.addr, arg_count: 0})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Int(0)], actual: msg.args[0], addr: msg.addr, arg_count: 0})),
         }
         match msg.args[1] {
             OscType::Int(i) => {
@@ -727,7 +727,7 @@ impl MessageBehavior for VmcExtMidiCcBit {
                     return Err(FromMessageErr::IntRange(IntRangeErr { expected_lower: 0, expected_upper: 1, actual: i, addr: msg.addr, arg_count: 1}));
                 }
             }
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Int(0), actual: msg.args[1], addr: msg.addr, arg_count: 1})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Int(0)], actual: msg.args[1], addr: msg.addr, arg_count: 1})),
         }
         return Ok(VmcExtMidiCcBit { knob, active });
     }
@@ -765,35 +765,35 @@ impl MessageBehavior for DeviceTranform {
         let mut quat = Quaternion::new(0.0, 0.0, 0.0, 0.0);
         match &msg.args[0] {
             OscType::String(s) => serial = s.to_owned(),
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::String(String::new()), actual: msg.args[0], addr: msg.addr, arg_count: 0})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::String(String::new())], actual: msg.args[0], addr: msg.addr, arg_count: 0})),
         }
         match msg.args[1] {
             OscType::Float(f) => origin.x = f,
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Float(0.0), actual: msg.args[1], addr: msg.addr, arg_count: 1})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Float(0.0)], actual: msg.args[1], addr: msg.addr, arg_count: 1})),
         }
         match msg.args[2] {
             OscType::Float(f) => origin.y = f,
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Float(0.0), actual: msg.args[2], addr: msg.addr, arg_count: 2})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Float(0.0)], actual: msg.args[2], addr: msg.addr, arg_count: 2})),
         }
         match msg.args[3] {
             OscType::Float(f) => origin.z = f,
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Float(0.0), actual: msg.args[3], addr: msg.addr, arg_count: 3})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Float(0.0)], actual: msg.args[3], addr: msg.addr, arg_count: 3})),
         }
         match msg.args[4] {
             OscType::Float(f) => quat.x = f,
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Float(0.0), actual: msg.args[4], addr: msg.addr, arg_count: 4})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Float(0.0)], actual: msg.args[4], addr: msg.addr, arg_count: 4})),
         }
         match msg.args[5] {
             OscType::Float(f) => quat.y = f,
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Float(0.0), actual: msg.args[5], addr: msg.addr, arg_count: 5})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Float(0.0)], actual: msg.args[5], addr: msg.addr, arg_count: 5})),
         }
         match msg.args[6] {
             OscType::Float(f) => quat.z = f,
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Float(0.0), actual: msg.args[6], addr: msg.addr, arg_count: 6})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Float(0.0)], actual: msg.args[6], addr: msg.addr, arg_count: 6})),
         }
         match msg.args[7] {
             OscType::Float(f) => quat.w = f,
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Float(0.0), actual: msg.args[7], addr: msg.addr, arg_count: 7})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Float(0.0)], actual: msg.args[7], addr: msg.addr, arg_count: 7})),
         }
         return Ok(DeviceTranform {
             addr: msg.addr.to_owned(),
@@ -843,7 +843,7 @@ impl MessageBehavior for VmcExtRvc {
                     return Err(FromMessageErr::IntRange(IntRangeErr { expected_lower: 0, expected_upper: 1, actual: i, addr: msg.addr, arg_count: 0}));
                 }
             }
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Int(0), actual: msg.args[0], addr: msg.addr, arg_count: 0})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Int(0)], actual: msg.args[0], addr: msg.addr, arg_count: 0})),
         }
         match msg.args[1] {
             OscType::Int(i) => {
@@ -853,12 +853,12 @@ impl MessageBehavior for VmcExtRvc {
                     return Err(FromMessageErr::IntRange(IntRangeErr { expected_lower: 0, expected_upper: 65535, actual: i, addr: msg.addr, arg_count: 1}));
                 }
             }
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Int(0), actual: msg.args[1], addr: msg.addr, arg_count: 1})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Int(0)], actual: msg.args[1], addr: msg.addr, arg_count: 1})),
         }
         if msg.args.len() == 3 {
             match &msg.args[2] {
                 OscType::String(s) => ip_addr = Some(s.to_owned()),
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::String(String::new()), actual: msg.args[2], addr: msg.addr, arg_count: 2})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::String(String::new())], actual: msg.args[2], addr: msg.addr, arg_count: 2})),
             }
         }
         return Ok(VmcExtRvc {
@@ -906,51 +906,51 @@ impl MessageBehavior for VmcExtLight {
         let mut color = Color::from_rgba(0.0, 0.0, 0.0, 0.0);
         match &msg.args[0] {
             OscType::String(s) => name = s.to_owned(),
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::String(String::new()), actual: msg.args[0], addr: msg.addr, arg_count: 0})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::String(String::new())], actual: msg.args[0], addr: msg.addr, arg_count: 0})),
         }
         match msg.args[1] {
             OscType::Float(f) => origin.x = f,
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Float(0.0), actual: msg.args[1], addr: msg.addr, arg_count: 1})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Float(0.0)], actual: msg.args[1], addr: msg.addr, arg_count: 1})),
         }
         match msg.args[2] {
             OscType::Float(f) => origin.y = f,
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Float(0.0), actual: msg.args[2], addr: msg.addr, arg_count: 2})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Float(0.0)], actual: msg.args[2], addr: msg.addr, arg_count: 2})),
         }
         match msg.args[3] {
             OscType::Float(f) => origin.z = f,
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Float(0.0), actual: msg.args[3], addr: msg.addr, arg_count: 3})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Float(0.0)], actual: msg.args[3], addr: msg.addr, arg_count: 3})),
         }
         match msg.args[4] {
             OscType::Float(f) => quat.x = f,
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Float(0.0), actual: msg.args[4], addr: msg.addr, arg_count: 4})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Float(0.0)], actual: msg.args[4], addr: msg.addr, arg_count: 4})),
         }
         match msg.args[5] {
             OscType::Float(f) => quat.y = f,
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Float(0.0), actual: msg.args[5], addr: msg.addr, arg_count: 5})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Float(0.0)], actual: msg.args[5], addr: msg.addr, arg_count: 5})),
         }
         match msg.args[6] {
             OscType::Float(f) => quat.z = f,
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Float(0.0), actual: msg.args[6], addr: msg.addr, arg_count: 6})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Float(0.0)], actual: msg.args[6], addr: msg.addr, arg_count: 6})),
         }
         match msg.args[7] {
             OscType::Float(f) => quat.w = f,
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Float(0.0), actual: msg.args[7], addr: msg.addr, arg_count: 7})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Float(0.0)], actual: msg.args[7], addr: msg.addr, arg_count: 7})),
         }
         match msg.args[8] {
             OscType::Float(f) => color.r = f,
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Float(0.0), actual: msg.args[8], addr: msg.addr, arg_count: 8})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Float(0.0)], actual: msg.args[8], addr: msg.addr, arg_count: 8})),
         }
         match msg.args[9] {
             OscType::Float(f) => color.g = f,
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Float(0.0), actual: msg.args[9], addr: msg.addr, arg_count: 9})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Float(0.0)], actual: msg.args[9], addr: msg.addr, arg_count: 9})),
         }
         match msg.args[10] {
             OscType::Float(f) => color.b = f,
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Float(0.0), actual: msg.args[10], addr: msg.addr, arg_count: 10})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Float(0.0)], actual: msg.args[10], addr: msg.addr, arg_count: 10})),
         }
         match msg.args[11] {
             OscType::Float(f) => color.a = f,
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Float(0.0), actual: msg.args[11], addr: msg.addr, arg_count: 11})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Float(0.0)], actual: msg.args[11], addr: msg.addr, arg_count: 11})),
         }
         return Ok(VmcExtLight {
             name,
@@ -989,16 +989,16 @@ impl MessageBehavior for VmcExtVrm {
         let mut hash: Option<String> = None;
         match &msg.args[0] {
             OscType::String(s) => path = s.to_owned(),
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::String(String::new()), actual: msg.args[0], addr: msg.addr, arg_count: 0})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::String(String::new())], actual: msg.args[0], addr: msg.addr, arg_count: 0})),
         }
         match &msg.args[1] {
             OscType::String(s) => title = s.to_owned(),
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::String(String::new()), actual: msg.args[1], addr: msg.addr, arg_count: 1})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::String(String::new())], actual: msg.args[1], addr: msg.addr, arg_count: 1})),
         }
         if msg.args.len() == 3 {
             match &msg.args[2] {
                 OscType::String(s) => hash = Some(s.to_owned()),
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::String(String::new()), actual: msg.args[2], addr: msg.addr, arg_count: 2})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::String(String::new())], actual: msg.args[2], addr: msg.addr, arg_count: 2})),
             }
         }
         return Ok(VmcExtVrm { path, title, hash });
@@ -1028,11 +1028,11 @@ impl MessageBehavior for VmcExtRemote {
         let json: String;
         match &msg.args[0] {
             OscType::String(s) => service = s.to_owned(),
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::String(String::new()), actual: msg.args[0], addr: msg.addr, arg_count: 0})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::String(String::new())], actual: msg.args[0], addr: msg.addr, arg_count: 0})),
         }
         match &msg.args[1] {
             OscType::String(s) => json = s.to_owned(),
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::String(String::new()), actual: msg.args[1], addr: msg.addr, arg_count: 1})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::String(String::new())], actual: msg.args[1], addr: msg.addr, arg_count: 1})),
         }
         return Ok(VmcExtRemote { service, json });
     }
@@ -1059,7 +1059,7 @@ impl MessageBehavior for VmcExtOpt {
                     option: s.to_owned(),
                 })
             }
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::String(String::new()), actual: msg.args[0], addr: msg.addr, arg_count: 0})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::String(String::new())], actual: msg.args[0], addr: msg.addr, arg_count: 0})),
         }
     }
 }
@@ -1087,19 +1087,19 @@ impl MessageBehavior for VmcExtSettingColor {
         let mut color = Color::from_rgba(0.0, 0.0, 0.0, 0.0);
         match msg.args[0] {
             OscType::Float(f) => color.r = f,
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Float(0.0), actual: msg.args[0], addr: msg.addr, arg_count: 0})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Float(0.0)], actual: msg.args[0], addr: msg.addr, arg_count: 0})),
         }
         match msg.args[1] {
             OscType::Float(f) => color.g = f,
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Float(0.0), actual: msg.args[1], addr: msg.addr, arg_count: 1})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Float(0.0)], actual: msg.args[1], addr: msg.addr, arg_count: 1})),
         }
         match msg.args[2] {
             OscType::Float(f) => color.b = f,
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Float(0.0), actual: msg.args[2], addr: msg.addr, arg_count: 2})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Float(0.0)], actual: msg.args[2], addr: msg.addr, arg_count: 2})),
         }
         match msg.args[3] {
             OscType::Float(f) => color.a = f,
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Float(0.0), actual: msg.args[3], addr: msg.addr, arg_count: 3})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Float(0.0)], actual: msg.args[3], addr: msg.addr, arg_count: 3})),
         }
         return Ok(VmcExtSettingColor { color });
     }
@@ -1152,7 +1152,7 @@ impl MessageBehavior for VmcExtSettingWin {
                     return Err(FromMessageErr::IntRange(IntRangeErr { expected_lower: 0, expected_upper: 1, actual: i, addr: msg.addr, arg_count: 0}));
                 }
             }
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Int(0), actual: msg.args[0], addr: msg.addr, arg_count: 0})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Int(0)], actual: msg.args[0], addr: msg.addr, arg_count: 0})),
         }
         match msg.args[1] {
             OscType::Int(i) => {
@@ -1162,15 +1162,15 @@ impl MessageBehavior for VmcExtSettingWin {
                     return Err(FromMessageErr::IntRange(IntRangeErr { expected_lower: 0, expected_upper: 1, actual: i, addr: msg.addr, arg_count: 1}));
                 }
             }
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Int(0), actual: msg.args[1], addr: msg.addr, arg_count: 1})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Int(0)], actual: msg.args[1], addr: msg.addr, arg_count: 1})),
         }
         match msg.args[2] {
             OscType::Int(i) => result.window_click_through = i,
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Int(0), actual: msg.args[2], addr: msg.addr, arg_count: 2})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Int(0)], actual: msg.args[2], addr: msg.addr, arg_count: 2})),
         }
         match msg.args[3] {
             OscType::Int(i) => result.hide_border = i,
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Int(0), actual: msg.args[3], addr: msg.addr, arg_count: 3})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Int(0)], actual: msg.args[3], addr: msg.addr, arg_count: 3})),
         }
         return Ok(result);
     }
@@ -1193,7 +1193,7 @@ impl MessageBehavior for VmcExtConfig {
         }
         match &msg.args[0] {
             OscType::String(s) => return Ok(VmcExtConfig { path: s.to_owned() }),
-            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::String(String::new()), actual: msg.args[0], addr: msg.addr, arg_count: 0})),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::String(String::new())], actual: msg.args[0], addr: msg.addr, arg_count: 0})),
         }
     }
 }
@@ -1222,21 +1222,21 @@ impl MessageBehavior for VmcThru {
         }
         return OscMessage { addr: self.addr.to_owned(), args}
     }
-    fn from_osc_message(msg: OscMessage) -> Result<Self, String> {
+    fn from_osc_message(msg: OscMessage) -> Result<Self, FromMessageErr> {
         if msg.args.len() > 2 || msg.args.len() < 1 {
-            return Err(String::from("arg count invalid"));
+            return Err(FromMessageErr::ArgCount(ArgCountErr { expected_in: vec![1, 2], actual: msg.args.len(), addr: msg.addr}));
         }
         let arg1: String;
         match &msg.args[0] {
             OscType::String(s) => arg1 = s.to_owned(),
-            _ => return Err(String::from("arg type invalid"))
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::String(String::new())], actual: msg.args[0], addr: msg.addr, arg_count: 0})),
         }
         let mut arg2: Option<ThruType> = None;
         if msg.args.len() == 2 {
             match msg.args[1] {
                 OscType::Int(i) => arg2 = Some(ThruType::Int(i)),
                 OscType::Float(f) => arg2 = Some(ThruType::Float(f)),
-                _ => return Err(String::from("arg type invalid"))
+                _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: vec![OscType::Int(0), OscType::Float(0.0)], actual: msg.args[1], addr: msg.addr, arg_count: 1}))
             }
         }
         return Ok(VmcThru { addr: msg.addr, arg1 , arg2  })