ummm big is not what I'd want...
I assume you are using knobman to make the png stacks, ..is that true?
IF yes, then one idea might be to have a dual pan knob that took up only one circle but had the width knob inside the pan knob
another idea could be no 'knob' but just a series of numbers with an L at the left and an R at the right... dragging on the numbers would move them
This could, I think, take up very little GUI space...
The numbers and the L and R could be diff colors.. so that all the L and numbers were for example green and the R and it's numbers red... or whatever two diff colors you like.
Just thinking out loud here... hope you don't mind
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