Video of the Phaedra Step Sequencer controlling the Bismark bs-16i soundfont player. Phaedra sends each of its patterns through a different MIDI channel to the bs-16i.
Note that the lights indicating the triggered step seem to go out of sync but the sound does not. This happens on my iPad 3 but not on my iPad 2. I don't know if this is a bug or if it's caused by the Retina display. I have used the iPad 3 to make the video.