A friends has let me loose on his JHS SD! drum synth, the kind of inexpensive 80's thing where the drum sound is generated by striking a foam covered plate above a speaker. The adding of a line in is fairly straight forward, but I'm at a loss for how to go about doing any modifications beyond that. Do people have any tips or guide lines for messing around with analouge gear?
Fortunately it seems that the chip in question is fairly common, so hopefully I can resurrect the bugger. You wouldn't happen to have any MC14070BCP chips lying around would you?