Well, it DID work.  Just FYI, in case anyone is wondering-Ive included a rough sketch I used to design the circuit:

awesome artistry, I know.

FYI-I used a 9v battery for the whole thing (outside of the power driving the drum synth).
I'll post a finished video when Im done with the piece, but in the meantime-here's a crappy demo of the semi-working sequencer breadboarded and running the synth via a piece of solder employed as a wire. (so professional, i know).:
https://youtu.be/x4Sf8JT98xE is link, or: