Fix voice.rs module to get things compiling for now. Still a long way from being usable.

src/voice.rs

@@ -3,7 +3,7 @@ use {pitch, time, Velocity};
 pub type Playhead = time::Samples;
 
 /// The current state of the Voice's note playback.
-#[derive(Copy, Clone, Debug)]
+#[derive(Copy, Clone, Debug, PartialEq)]
 pub enum NoteState {
     /// The note is current playing.
     Playing,
@@ -24,25 +24,25 @@ impl Voice {
     pub fn new() -> Self {
         Voice {
             note: None,
-            playhead: 0,
+            playhead: time::Samples(0),
         }
     }
 
     /// Trigger playback with the given note.
     #[inline]
-    pub fn note_on(&mut self, hz: NoteHz, vel: NoteVelocity) {
-        self.maybe_note = Some((NoteState::Playing, hz, vel));
+    pub fn note_on(&mut self, hz: pitch::Hz, vel: Velocity) {
+        self.note = Some((NoteState::Playing, hz, vel));
     }
 
     /// Release playback of the current note if there is one.
     #[inline]
     pub fn note_off(&mut self) {
         if let Some(&mut(ref mut state, _, _)) = self.note.as_mut() {
-            *state = NoteState::Released(0);
+            *state = NoteState::Released(time::Samples(0));
         }
     }
 
-    pub fn fill_buffer(&mut self, buffer: &mut [S]) {
+    pub fn fill_buffer<S>(&mut self, buffer: &mut [S]) {
     }
 
 }