It is possible that all you need to do is install a switch that connects the junction of the .01uf cap and 1k5 resistor to ground, but the circuit is different in several other ways, so that is not a guaranteed result. But it is easy enough to do without destroying anything, so you can give it a try.
I think all you need to do is add a switch to lifting the earth connection at the 4.7 µF capacitor....I've done it by accident myself so I know it works. It's not a great volume pedal though. The Jen Wah-Volume pedal switches in a 4K7 resistor and 0.22 µF cap in series across the 0.01µF sweep cap.
Yes there are combo wah-volume pedals -- the Jen I mentioned, the old Maestro Boomerang too -- but converting a bog standard crybaby? It can be done (I've done it by accident, as I mentioned), but what you get is a pretty crappy volume pedal. I'd ask bleedingfingers if there was a way to do it better than the way I mentioned, but I don't think so.
Yes there are combo wah-volume pedals -- the Jen I mentioned, the old Maestro Boomerang too -- but converting a bog standard crybaby? It can be done (I've done it by accident, as I mentioned), but what you get is a pretty crappy volume pedal. I'd ask bleedingfingers if there was a way to do it better than the way I mentioned, but I don't think so.
+1 on this. It can be done fairly easily but it makes a crappy volume pedal. I've done it in the past just for fun to see how it would work and it went back to being a wah fairly quickly.
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