How can I get 4 ins or 4 outs with the M-Audio AudiophileUSB?

Inputs 1-2 come from either the 1/4" inputs or RCA inputs (not both at the same time), and the outputs 1-2 are on RCA analog.

The S/PDIF input and output function as inputs 3-4 and outputs 3-4 if they are selected and if you are not using 96kHz sampling rate.

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