I have a dunlop gcb95 crybaby, but it doesn't look like others I've seen, it has a chickenhead dial on side that seems to shrink or lengthen the 'speed' of the wah. I was thinking of modding it, but I don't know if it's the same as the others.

my second question is, the wah sounds good on a clean setting, but when I put on the amps distortion the wah is almost nonexistant, just garbled. how do you get around that?
if you use pedals, put the wah before everything else. wahs are always less of an effect with distortion on though.