Using two Wiimotes feeding a Macbook via Bluetooth, to trigger solenoid-played drums.
Jazari’s website, and a post on Engadget. (Yes, cowbell.)

Dave Wright found this at a “junk shop” in Tucson. It uses two CEM 3394 chips, plus a PAIA MIDI-CV and a few assorted circuits. It was very well-made, almost commercial quality. The maker’s identity is a total mystery.

Video:
mystery homebrew synth