Circuit Bent Musini Pt. 3 - Midi-controlled SynthI love the Musini, and while I was bending a new one, I discovered that it uses a synth on chip for digital audio. The chip uses one pin for midi data. Turns out you can make some simple modifications to send midi into the chip and play it with a midi controller. I'll post pics soon, but the mod is simple:
1. Take your midi out ground pin to the pin labeled ground on the Musini's cartridge slot.
2. Cut the midi wire coming from the cartridge slot.
3. Take the midi out current source pin to the wire you just cut (the end that connects to the main board).
4. Play some notes on your midi controller.
It helps to turn the sensitivity on the Musini all the way down so you don't mix in the built in signals. If you have a cartridge, you can insert that to block any unwanted midi signals.
From there, it's just a matter of sending the right midi messages to get more out of the chip. I can switch through the 128 instruments, but I haven't figured out some of the more complex commands. The chip has a ton of effects built in, including reverb, portamento, chorus, flanger, etc. I haven't figured out how to get my controller to send the messages to activate them, but my controller has a limited interface.
edit: here's a diagram