#1
Alright, I'm planning to do a cover of the Jeff Beck song Cause We've Ended As Lovers for a local talent show soon, but a little before three minutes in, Jeff's volume and gain both increase. To get this effect, I was wondering if I could use my wah pushed all the way down as a treble/volume booster? Or would that screw my sound?

Advice is much appreciated as usual.
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#2
It would probably not work well because it would be filtering the adjacent frequencies (depending on how deep a filter it is).