vastly improved selection system

src/main.rs

@@ -231,6 +231,7 @@ fn main() -> io::Result<()> {
                         snapshot: &seq_snapshot,
                         playing: &playing,
                         audio_tx: &sequencer.audio_tx,
+                        seq_cmd_tx: &sequencer.cmd_tx,
                         nudge_us: &nudge_us,
                     };