For the stereo channels and master section, the schematics illustrate the summing amplifiers. These op-amps combine the signals from all channels. Precision resistors are critical in this area to maintain channel separation and low noise. The Digital Domain: FX and USB
Houses the analog voltage-controlled amplifier (VCA) circuitry dedicated to the one-knob inline compressors found on channels 1 through 8. 2. Digital Effects (FX) Subsystem behringer xenyx x2222 service manual