PARALLEL SOUNDS LETS GOOOOOO

src/main.rs

@@ -13,8 +13,9 @@ fn main() {
         flags.sound_font,
         flags.sample_rate,
     ));
+    syn_seq.append(1, "3c1");
     if let Some(play) = flags.play {
-      syn_seq.append(play);
+      syn_seq.append(0, play);
     }
 
     play(syn_seq, flags.sample_rate, flags.bpm);

src/seq.rs

@@ -2,37 +2,55 @@ use crate::tone;
 use crate::syn;
 
 pub struct SynSeq {
-   seq: Seq,
+   seqs: std::collections::HashMap<i32, Seq>,
    syn: syn::Syn,
 }
 
 pub fn new_syn(syn: syn::Syn) -> SynSeq {
    SynSeq{
-      seq: new(),
+      seqs: std::collections::HashMap::new(),
       syn: syn,
    }
 }
 
 impl SynSeq {
-   pub fn append<S: ToString>(&mut self, s: S) {
+   pub fn append<S: ToString>(&mut self, ch: i32, s: S) {
-      self.seq.append(s);
+      match self.seqs.get_mut(&ch) {
+         Some(seq) => seq.append(s),
+         None => {
+            let mut seq = new();
+            seq.append(s);
+            self.seqs.insert(ch, seq);
+         },
+      };
    }
 
    pub fn render(&mut self, left: &mut [f32], right: &mut [f32]) {
-      match self.seq.pop() {
+      for (ch, seq) in self.seqs.iter_mut() {
+         let ch = ch.clone();
+         match seq.pop() {
             (Some(tone), changed) if changed => {
-            self.syn.set(0, Some(tone.clone()));
+               self.syn.set(ch, Some(tone.clone()))
             },
             (None, changed) if changed => {
-            self.syn.set(0, None);
+               self.syn.set(ch, None);
             },
             _ => {},
          };
+      }
       self.syn.render(left, right);
    }
 
    pub fn beats(&self) -> usize {
-      self.seq.beats.len()
+      let mut longest = 0 as usize;
+      for (_, seq) in self.seqs.iter() {
+         longest = if seq.beats.len() > longest {
+            seq.beats.len()
+         } else {
+            longest
+         };
+      }
+      longest
    }
 }