I took the standard Crumar Trilogy with it’s 7 presets and 1 manual position and replaced that board with a Teensy based MUX/DEMUX circuit to read in all the controls, store them into memories displayed on the OLED display and write out the parameters as CV that the Trilogy could understand. I started with just the same synth section that was programmable on the original and included the octave switches etc around the oscillators.
I then went on to convert the LFO, glide, organ and then strings sections to be remembered by the new programmer. So now it can store 999 mixes of Polysynth, strings, organ.
One last thing to do is add a rotary section to the organ for more realistic sounds.
I know the Trilogy is just a glorified string machine with a 6 voice filter/env added, but this does expand the functions and speed at which the whole synth settings can be recalled even over MIDI.
