The OS and both sound roms are now external to the unit and can be swapped out for changing from the stock sounds. This is a pretty common mod.
The circuit bends on my unit are the standard ROM/RAM patch points for which I used tiny 2.54mm sockets rather than banana or 3.5mm jacks.
Any of these can be routed to momentary or toggle switches in addition to be being controlled via the 4 3.5mm trigger inputs. These 4 inputs
connect to a 4066 switch chip. When the chip gets a 5v signal, it "shorts" the 2 patched inputs, so you can externally control bends with something
like an Ardunio, Teensy, or the gate/trigger output of modular synths. I had planned on wiring up all of the 16 pads to be triggered externally as
well but the trigger pads at best (based on my testing w/ a siggen) can be triggered around 25Hz. Notes can be triggered MUCH faster via MIDI.
I also did the standard LTC1799 pitch control, but with a few twists. First a 3 way toggle to go through all the different ranges of the LTC
circuit. And in addition to the course and fine pot controls, I made a vactrol out of a white LED and photoresistor which allows me to connect
up CV from my modular synths to control pitch. There's also a resistive strip and photoresistor that can drive the LTC.
There are 2 toggle and 4 momentary switches for controlling bends or the pitch on/off.
I may try reversing the firmware and making some updates at some point. Would love to have pitch and decay envelopes for the individual sounds.