Hi everyone, my first real 'completed' project -- code + breadboard, at least, I still need to build it into something permanent.
If anyone has seen the SX-150 Synthesizer by Gakken, you know that it has no keyboard, just a 'stylus-and-ribbon' interface which is cool, but hard to use for anything besides just fiddling.
So, I built a 4-step sequencer for it, controlled by a rotary encoder and some 'step-enable' buttons, and all run through the arduino, of course.
The project is shown in my blog:
Part 1 demonstrates hacking the SX-150 and getting initial pitch control through the an arduino-controlled digital potentiometer: http://totusterra.com/index.php/2010/01/01/hacking-the-sx-150-building-an-arduino-b-1
Part 2 has me going from pitch control to full note-on/note-off control of a 'tuned instrument': http://totusterra.com/index.php/2010/01/09/hacking-the-sx-150-building-an-arduino-b-2
Part 3 is where the sequencer really comes together with the hardware interface, (mostly) finished source code, etc.: http://totusterra.com/index.php/2010/01/24/hacking-the-sx-150-building-an-arduino-b-3
There are schematics, photos and source included all the way through, and there's a video of the final product in part 3.
Hope someone finds it interesting 
Jeff / Totus Terra
