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The A-138o is the output to Doepfer’s Performance Mixer system. Up to four A-138p’s can be chained to the module, giving users additional input channels. The module itself is a master channel and aux send/return, and features a convenient output with dedicated level knob so that users can balance their output signal with other line level gear. Additionally, the module features L/R stereo outputs, and one mono aux send/return.