Déjà Vu

A two-channel fader utility for voltage and audio: each channel has a FADER input, an ADD input and an output with a green/red polarity light. The FADER MODE switch sets attenuation, attenuversion or a crossfade between FADER and ADD; FADER GAIN boosts the faded signal 1x, 2x or 10x, enough to bring line level up to Eurorack level. With nothing in the FADER input the fader is a voltage source, and output A, left unplugged, is mixed into output B.