Refactor MIDI message handling to use fluidlite's Chan type for chann…

…el representation

neothesia-cli/src/main.rs

@@ -1,6 +1,9 @@
 use std::{default::Default, time::Duration};
 #[cfg(feature = "fluid-synth")]
-use {fluidlite::{Settings, Synth}, std::sync::Arc};
+use {
+    fluidlite::{Settings, Synth, midi::Chan},
+    std::sync::Arc,
+};
 
 use neothesia_core::{
     config::Config,
@@ -175,10 +178,15 @@ impl Recorder {
             for e in &events {
                 match e.message {
                     midi_file::midly::MidiMessage::NoteOn { key, vel } => {
-                        synth.note_on(e.channel as i32, key.as_int() as i32, vel.as_int() as i32).ok();
+                        let chan = Chan::try_from(e.channel as u32).unwrap();
+                        let key = key.as_int() as u32;
+                        let vel = vel.as_int() as u32;
+                        synth.note_on(chan, key, vel).ok();
                     }
                     midi_file::midly::MidiMessage::NoteOff { key, .. } => {
-                        synth.note_off(e.channel as i32, key.as_int() as i32).ok();
+                        let chan = Chan::try_from(e.channel as u32).unwrap();
+                        let key = key.as_int() as u32;
+                        synth.note_off(chan, key).ok();
                     }
                     _ => {}
                 }