In search of making an interactive MIDI sequencer with Arduino I came across this.
http://code.google.com/p/cahors/wiki/Composition
While the wiki is pretty understandable about writing a song it is not so with the actual sequencer code.
My goal is to use photocells sensors to start to play a sequence of MIDI notes on different channels. So I wonder if cahors could be used together with sensor input. Like if sensor could trigger different parts or start points in the main sequencer loop.