Here comes a Quad CP3 Mixer with 16 Mixer Channels in MOTM Format.
Pcb design from Manhatten analog, designed for Eurorack for 12V and 15V
Pcbs : Fullkit from synthcube
Panel: custom Panel, ordered by Schaeffer
 10/22/47uF electrolytic (i used for power 22uF, for others 10uF)
 0.1uF ceramic
 3.3nF poly
 10uF electrolytic
 10uF electro; optional for +12V regulator
 10-50k audio, 9mm Alpha or similar
 25-50k linear, 9mm Alpha or similar
 2k multiturn trim
 100R multiturn trim
 LM78L12; optional for +/-15V supplies ONLY
 LM337LZ - be sure to get the one in the TO-92 package
 2N3904 (or similar NPN) - Matched pair
 2N3906 (or similar PNP) - Matched pair
 10-pin .100 header, male (Euro power) OR 4-pin MTA-156 header (MOTM power)
 Ferrite bead (can substitute 10R resistor)
 PTC resettable fuse (.050 hold, .100 trip) - can replace with wire link
 1N4001 diode
 3.5mm jack, 16PJ138 or Erthenvar/Thonk style
 Davies 1900H-style knob, or any other ~12.5mm-diameter knobs you prefer.
1) For use with +/-12V supplies, jumper pins 1 and 3 of the 78L12 and omit the adjacent cap.
2) Adjust the 2k trimpot until the output of the LM337 is -6.0V.
3) Adjust the 100R trimpot until the output has no DC offset.
Building note: for 15V use a additional LM337