borrow.rs

pub fn set_voice_note_off(&mut self, note_data: NoteData){

      for voice in &mut self.voices {
          match voice.state {
              // we only care if the note is currently on
              VoiceState::On => {
                  // check if this voice is currently playing the note desired to be turned off
                  if voice.note_data.note == note_data.note {
                      // success - we found the voice to turn off
                      // replace the stored `voice.note_data` with our new `note_data`
                      voice.note_data = note_data;
                  }
              }

              // we don't care about anything else here
              _ => return
          }
      }
  }