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by bprater 6707 days ago
If you aren't necessarily focused on tying hardware controllers to a software app (which limits you to MIDI stuff), you might consider one of the basic programmable microcontrollers, like the Parallax BASIC Stamp:

http://www.parallax.com/

It is designed to be easily plugged into devices, gives you a simple programming language, and a way to interface with a computer. I bet you can snag one on Ebay for cheap.