Another massive analogue beatbox mod. This one is a Yamaha MR10 mounted in a 3 unit rackmount case:
Mods include:
Bass drum pitch
Bass drum decay
Snare level
Snare noise decay
High tom decay (also used as the snare shell sound)
Low tom decay
Conga trigger button (this sound not usually accessable outside of the patterns)
Toms / Conga level knob
Toms / Conga filter
Closed hat trigger
Open hat trigger (neither hat is accessable outside of the patterns)
Open hat decay
Hats Level (normally grouped with the cymbal on front panel cymbals level knob)
Hats filter
Cymbal Level
Cymbal Decay
Cymbal filter
Wide overall tuning knob (affects toms, snare, hats and cymbals)
Midi Triggering
individual outs for bass drum, hats, snare, toms / conga, cymbal
The open/closed hi hata are the same sound with the different decay triggering taken care of 'on chip' by the big synth chip. In order to trigger the open and closed hats externally you have to use one trigger pulse to trigger the closed hat with a certain resistance setting the decay, and another to trigger the same sound but with a pot switched into the circuit to control a longer decay. Then every time you want to trigger the closed hat again you need to switch the pot out of the circuit.
I've more or less got it sorted using a PIC and some logic switching to interpret the trigger pulses, but getting everything to work fast enough and in the right order is one of those things that makes my brain feel like its about to dribble out of my ears even thinking about it for too long.
There will be a write up and demos on the main site once i sort out some bugs with the triggering.