Circuit bent Casio SA-2Modifications-
1. Red power on LED.
2. D.C. power socket.
3. 1/4" jack socket.
4. Bass drum trigger.
5. Hi-hat trigger.
6. Snare trigger.
7. 5th's switch. Plays note a 5th higher at the same time.
8. Glitch randomizer. Pot and toggle switch.
9. Tone generator. Pot and toggle switch.
10. 'Wasp' tone generator. (creates wasp sounding drone effect that also boosts treble). Toggle switch.
11. Distortion/feedback. Pot and on/off switch.
12. Hidden sounds selector switch.
13. Re-housed in sturdy MDF case with 4 rubber feet!
There is a lot more stuff you can do with these keyboards i.e. 5th lower switch, power crash, extra drum triggers for rim shot, hand clap and cymbal etc. Also more hidden sounds are available. I was unable to achieve any more with this keyboard as my soldering was so blobby I didn't dare risk any more attaching to the chips through fear of joining adjacent legs together. Most of the info for this came from Peter Edwards schematics from Casper electronics -
http://www.casperelectronics.com/finished-pieces/casio-sa-keyboards/ And it wouldn't have been possible without this forum and Breakbeatnazi's help. Thanks all!