Continuing my newfound role as Herbert West the Thread Reanimator:
I'm doing the data-line mod on my PSR-11 right now and it hit me that theres no need to cut the traces and solder to the IC-pins, the data line connections on the one i have passes through a row of resistors, i've just desoldered them and rigged the switches there.
Seems to work ok.
#famouslastwords
EDIT-
So the data line resoldering went well, replaced the resistors and/or jumper wires with wired switches with matching resistors and it works. The awesome randomness that comes out of this machine is very fun, but completely haphazard, i'm a boring man with ambitions of using bent stuff for ordinary music so i'm thinking about ways to make it more playable. The result however is highly usable for sampling and editing individual sounds. Messy but worth it i think.
I've also found that something (perhaps the ribbon that goes from the speaker/phone pcb to the power and volume switch pcb) is making a high pitched whine in there. I managed to shield that cable a little and switched the polarity of the built in speaker, took it down a bit, it's just barley audible at low volume... maybe a noise gate pedal would make it a non problem.
If anyone has some input on how to solve the whine issue please do tell!
EDIT II-
Yeah the whine i was whining about, turns out its ground hum, about 12 resonant freqs of 50hz. I can notch away the most horrible ones when sampling this randomizer.
I've gotten hooked on this chips sound now, i'd like a madness thing that sounds equally disturbing but cleaner. In the signal i mean.