#2
What? you mean like wah one up and one down?

you could do that with a concentric pot, and i think that you could, but it would be a right pain in the ass, and i don't know what this would accomplish.
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#4
You could attach something to both wahs that make them in sync with eachother, like weld a metal bar to the front of the expression bit, and one at the back.

That could work. But why? You'll still get a normal wah sound, nothing spectacular (I've tried it before)
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#5
A dual pot maybe?
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+1