diff --git a/src/main.rs b/src/main.rs
index 91129ee..d2072c7 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -8,17 +8,20 @@ mod seq;
 fn main() {
     let flags = flags::Flags::new();
 
-    let mut syn = syn::Syn::new(
+    let mut syn_seq = seq::new_syn(syn::Syn::new(
         flags.debug,
         flags.sound_font,
         flags.sample_rate,
-    );
-    syn.tone_on(0, tone::new("c+5"));
+    ));
+    syn_seq.append("c");
+    syn_seq.append("2e");
+    syn_seq.append("g");
+    //syn.tone_on(0, tone::new("c+5"));
 
-    play(syn, flags.sample_rate, flags.bpm);
+    play(syn_seq, flags.sample_rate, flags.bpm);
 }
 
-fn play(mut s: syn::Syn, sample_rate: usize, bpm: usize) {
+fn play(mut s: seq::SynSeq, sample_rate: usize, bpm: usize) {
     let samples_per_beat = sample_rate / bpm * 60;
     let params = tinyaudio::prelude::OutputDeviceParameters {
         channels_count: 2,
diff --git a/src/seq.rs b/src/seq.rs
index 80a4692..337df94 100644
--- a/src/seq.rs
+++ b/src/seq.rs
@@ -1,8 +1,33 @@
 use crate::tone;
 use crate::syn;
 
+pub struct SynSeq {
+   seq: Seq,
+   syn: syn::Syn,
+}
+
+pub fn new_syn(syn: syn::Syn) -> SynSeq {
+   SynSeq{
+      seq: new(),
+      syn: syn,
+   }
+}
+
+impl SynSeq {
+   pub fn append<S: ToString>(&mut self, s: S) {
+      self.seq.append(s);
+   }
+
+   pub fn render(&mut self, left: &mut [f32], right: &mut [f32]) {
+      if let Some(tone) = self.seq.pop() {
+         self.syn.tone_on(tone);
+      }
+      self.syn.render(left, right);
+   }
+}
+
 #[derive(PartialEq)]
-struct Seq {
+pub struct Seq {
    beats: Vec<(i32, tone::Tone)>,
 }
 
diff --git a/src/syn.rs b/src/syn.rs
index f2a180a..c7c3298 100644
--- a/src/syn.rs
+++ b/src/syn.rs
@@ -31,7 +31,8 @@ impl Syn {
         Syn::Real(synthesizer)
     }
 
-    pub fn tone_on(&mut self, a: i32, b: tone::Tone) {
+    pub fn tone_on(&mut self, b: tone::Tone) {
+        let a = 0 as i32;
         match self {
             // channel=[0..16)
             // velocity=[0..128)
@@ -50,7 +51,8 @@ impl Syn {
         };
     }
 
-    pub fn tone_off(&mut self, a: i32, b: tone::Tone) {
+    pub fn tone_off(&mut self, b: tone::Tone) {
+        let a = 0 as i32;
         match self {
             Syn::Real(syn) => syn.note_off(a, b.i32()),
             Syn::Text{m, ..} => {
@@ -83,10 +85,10 @@ mod test {
    fn test_new_real() {
       let mut syn = Syn::new(false, "super_small_font.sf2".to_string(), 44100);
 
-      syn.tone_on(1, tone::new("c"));
-      syn.tone_on(2, tone::new("d"));
+      syn.tone_on(tone::new("c"));
+      syn.tone_on(tone::new("d"));
 
-      syn.tone_off(2, tone::new("d"));
+      syn.tone_off(tone::new("d"));
 
       let mut buffer1 = Vec::<f32>::new();
       let mut buffer2 = Vec::<f32>::new();
@@ -97,10 +99,10 @@ mod test {
    fn test_text() {
       let mut syn = Syn::new(true, ".sf2".to_string(), 1);
 
-      syn.tone_on(1, tone::new("c"));
-      syn.tone_on(2, tone::new("d"));
+      syn.tone_on(tone::new("c"));
+      syn.tone_on(tone::new("d"));
 
-      syn.tone_off(2, tone::new("d"));
+      syn.tone_off(tone::new("d"));
 
       let mut buffer1 = Vec::<f32>::new();
       let mut buffer2 = Vec::<f32>::new();