I'd think that the outboard hardware is what decides that turning knob X
to position Y generates a MIDI event. I'd think that if you want to use
the actual raw voltage/current value that knob X is actually outputting,
you'd have to do that at the hardware end, not the event-receiving end.
But I suppose you could arbitrarily define MIDI event value 0 or 1 as
the beginning, and the current knob value as the end, and
programmatically generate some kind of audio signal. Or something like that.
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