Abstract: The audio processing system for use in the mix down and mastering phases of professional audio recording includes: an audio patchbay unit, a logic control unit, a power supply unit, and an audio processing unit. The patchbay unit couples the system to a mix console and effects equipment. The audio processing system includes several balanced stereo paths which can be selectively coupled in parallel and in series. Each audio path includes at least two insert points which can be selectively inserted or removed from the signal path. Switches and indicators, controlled by the logic control unit are designed to reconfigurable. These switches and indicators are included on control panels which are located either on the audio processing unit or the mix console. CMOS components minimize the introduction of noise.