Barton BMC080 Diode Low Pass Filter (PCB)

This is a 4-pole diode-ladder low pass filter. Useful for big classic analog filter sweeps. One audio and two cv inputs.

This module is designed for 12V systems. Getting it to work on a 15V system may require adjusting a couple of resistor values, but it's untested so far. It does not require hand-matching diodes or transistors, though doing so may improve results.

More info here.