Panel and PCBs from Synthcube:
3x 3P3T Switch: mouser: 612-1003P3T1BM1QEH
Important INFO: the Jack Hole Audio Out must be changed (drilling) to the panel border side otherwise the switch and jack are too close and will not fit in a correct alignment.
normally you don't need the TL074 and the resistors around.. look in the schematics - its only for the CV and Audio "Mixer" - which isn't needed here.
the following wiring do not match with the schematics ( I didn't used this wiring !!) please look in the schematic as described
(the wiring was used by me for the Triple LPG - but you must turn the switch 180degrees that it match with the panel silkscreen)
I used 10KA Potentiometers for the bottom mixer, I just connected from each LPG output (output jack) the signal to the bottom mixer poti, an 1K pullup resistor on the wiper
Take care on the Jumpers (routing with or without CV/Audio Mixer)
in my configuration I used the direct way - without the mixers.