I have a prototype of a music app I am working on, and I’m happy to offer it for you LD’ers to use if you like. The only catch is that you will have to capture the output using an audio tool like Audacity, since it doesn’t save to WAV or MP3.
It’s basically a chip-tune monome. Here’s the linky: http://www.madgarden.net/junkz/codez/pixelblipz.zip
And here’s a screenshot of it in action: