added type string method to SAtom

src/dsp/satom.rs

@@ -62,6 +62,16 @@ impl SAtom {
             _                                => None,
         }
     }
+
+    pub fn type_str(&self) -> &str {
+        match self {
+            SAtom::Str(_)         => "str",
+            SAtom::MicroSample(_) => "micro_sample",
+            SAtom::AudioSample(_) => "audio_sample",
+            SAtom::Setting(_)     => "setting",
+            SAtom::Param(_)       => "param",
+        }
+    }
 }
 
 impl From<f32> for SAtom {

src/matrix.rs

@@ -399,7 +399,7 @@ pub trait MatrixObserver {
     /// Called when a parameter or it's modulation amount is changing.
     /// Not called, when [MatrixObserver::update_all] tells you that
     /// everything has changed.
-    fn update_param(&self, ParamId: &ParamId);
+    fn update_param(&self, param_id: &ParamId);
     /// Called when the matrix graph was changed, usually called
     /// when [Matrix::sync] is called.
     /// Usually also called when [MatrixObserver::update_all] was called.