The knobs have fixed CC values. There is a picture for the Virus B at access' site (in the downloads/miscellaneous section) that diagrams all of the knobs, buttons, and they're values, but there isn't one for the C or IndigoII. It might be a starting point, though.
An easy way to figure them out is to just record the MIDI into a sequencer and start twisting knobs, and see what MIDI data shows up...
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