I'm not sure - I'm not a designer of pre/pros, but I would have thought the 'knob' was attached to a digital encoder on modern equipment - the 1050 sure acts that way since there are no limits of travel - it turns until you get tired.

That would mean the 'knob' actually is controlling a variable in the software that is part of the internal math.

The internal math would determine the digital values that are applied to the output DACs.

Just a guess.