Mixer

The mixer, is an electronic device for combining, routing, and changing the level, tone and dynamics of audio signals.

Schematics

 * There are a couple of mixer schematics at Scott Stites Synth DIY
 * Minimoog Mixer, Noise and Power supply
 * Digisound 80, 80-4 Voltage Controlled Mixer
 * Modules at Ken Stone's Modular Synthesizer includes a number of mixers