M-Audio/Fast Track Ultra/Linux

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Image 2: QasMixer set up to send system stereo to outputs 7 and 8, in stereo

The FTU works in Linux without any special drivers (at least as of e.g. Ubuntu 20.04 or so), though you will need to install a mixer app to handle the details.

The FTU has an internal routing system which can be accessed via ALSA, using QasMixer: a matrix of every possible connection between input and output is presented to ALSA as a long row of volume-sliders. In order to route system output to, say, outputs 7 and 8, you would set all outputs to zero except Din1-Out7 and Din2-Out8 (see image 2), routing each of those two inputs to their respective outputs.

ALSA will also let you use the internal reverb effects, and route signals to/from those effects and to/from external effects sends – in theory allowing the FTU to be used like a mixing board, but with software controlling most of the features.

I'm still working out the details of how to implement some configurations. It seems to be easier to monitor all inputs than to record them...

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