Ali Afshar (alialiali on the forum) built a chordboard – a nifty synth project that includes a drum sequencer.

Ali describes this labor or love project as playing the major keys of piano with the ability to change the key and mode.  It’s pretty easy to play and get a decent result.  It also features a drum sequencer, strings, chords, and other stuff.  The interface uses the oh so satisfying Cherry MX keys that have LEDs in them and a few pots to control things like tempo.