If you want a solution that works for all GUI's, I'd switch to a fader...it's a better fit for a touch screen.
How about Touch-down on the knob, hold for 1 second, and a mask appears over it...swipe the mask left or right and that parameter is assigned to either a vertical left-side or right side fader. 2 fader control makes sense since in an knob paradigm you can only twist 2 knobs at a time.
Just a thought...
Cheers
K
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