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a reverse wah?

The Morley Power Wah can drop below the original note for a deep, rumbling sound. It's not set up like a reverse wah (you have to pull back to do it), but it's a more dramatic and noticeable effect than you'd get from a Dunlop wah. Heck, you won't even get it out of a switchless wah.
 
Well since you can rock a wah in either direction, wouldn't you just be able to basically do that with a normal wah?

How I understand his description of what he wants, yes.

Not how Im thinking. As it has to ascend above the note of origin to get back to it on a normal wah. What I was wanting was the reverse- to go below it in effect sounding lower

The way you keep describing it, it sounds like you can do what you want by reversing your foot sweep. Sure you could reverse the pot on the inside to go in the other order, but you don't NEED to, just reverse the direction you move your foot.
 
Sounds obvious, but you need to start with the filter set high, as in toe down position. Otherwise, just sweeping downwards you quickly discover that the filter goes more-or-less subsonic pretty quickly and it has virtually no effect.

For example, my Morley PWO has barely any audible effect in the first 1/4 or the pedal sweep unless you're connected to a rig that is capable of communicating with elephants!

Definitely check out an envelope filter with a downward sweep.
 
You can rewire the pot in non-optical wah to do that. You could probably even put a switch to go from normal to reverse. The only wah I can think of that did this as stock was the old Electro-Harmonix Crying Tone.

is a jimi hendrix crybaby able to do this? could i put in a twist switch on the side, so as to select with the turn of a nob?

can you give me more information please sonicvi or anyone else who knows about this

thank you

also, the boss wah's can switch polarity, at least the AW and TW on the gt6b do
 
The Boss AW-3 DOES have this function. Whether or not it achieves it "well" is a different question. If you've got a large enough speaker using this pedal with a sub-octave pedal can give quite a massive dub sort of wah sound, but yeah any standard wah, used as described above, should sort you out.