The Firewire Audio Interface; Inputs; Outputs - M-Audio ProjectMix I/O User Manual

The FireWire Audio Interface

The ProjectMix I/O audio interface is capable of several different audio configurations, which are all selectable on the hardware page of the
Control Panel software. (We introduce the full range of functions in the Control Panel in the following section.)

Inputs:

Analog inputs (XLR / LINE INPUTS 1 – 8) will always appear as audio streams 1– 8.
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When spdif input is selected on the hardware page, the left and right S/PDIF inputs will appear as audio streams 9 and 10.
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When adat input is selected on the hardware page, ADAT channels 1 – 8 will appear as audio streams 9 – 16.
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Outputs:

Analog outputs 1 – 4 will always appear as audio streams 1– 4.
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When spdif output is selected on the hardware page, the left and right S/PDIF outputs will appear as audio streams 5 and 6.
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When adat output is selected on the hardware page, ADAT channels 1 – 8 will appear as audio streams 5 – 12.
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These assignments represent the ProjectMix I/O functioning at 44.1kHz or 48kHz sample rate. When you raise your sample rate above 48kHz,
the ADAT ports will switch to S/MUX II mode. In this mode, the number of channels that can be routed through ADAT is cut in half—only 4
channels can be input and output at a time. (When in S/MUX II mode, the first four ADAT streams will carry audio while the other four streams
will carry silence.)
The audio interface of the ProjectMix I/O allows 16 audio streams to be sent to the computer and 12 streams to be returned to the ProjectMix
I/O. The audio input streams are assigned as follows:
The audio input streams are assigned as follows:
XLR / Line Inputs 1 through 8 > Audio Streams 1 through 8
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ADAT channels 1 through 8 > Audio Streams 9 through 16
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The audio output streams are assigned as follows:
Audio Streams 1 through 4 > Analog Outputs 1 through 4
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Audio Streams 5 through 12 > ADAT output channels 1 through 8
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10 The FireWire Audio Interface