The 308 offers three parameters on the faceplate: TONE sets the brightness level, FILTER dials in the high frequency response, and DRIVE determines the signal gain. Latter parameter can be voltage controlled.
A small DIP switch on the faceplate selects which diodes are used for clipping: 1N4148 diodes, LEDs, germanium diodes or none at all.
Input impedance can be set with a trimm potentiometer.
input, output, gain CV input
3U Eurorack module, 4HP wide, 38mm deep