It's as close to done as I can get it for now so check it out if you're interested, will post video of me playing my 303 with my bass later tommz. If anyone has any ideas for further development especially regarding adaptive filtering I welcome their input.
Yeah one of the things I keep meaning to do is feed the double bass signal straight into the filter section and cut out the vco, that way the troublesome pitch tracking wouldn't matter, I'd just be doing bonk detection to trigger the gate.
After reading the blog something you might try when you start work on it again.
Feed the input to a phase locked loop, and feed the output of the VCO into your detector circuit. In that way when you lock on to a note it won't jump an octave as the fundamental decays away making some of the harmonics bigger than the fundamental. The PLL will stay in lock as long as it has something to lock to.