I just got a Wilson Effects 12-Position Q Wah. It comes stock with a 12-position external knob that controls the sweep response of the wah (6 increasingly higher settings, 6 increasingly lower settings) and a pot that controls the Q. I got mine with extra external pots for the bass response/gain, mids, and volume, and a blue status LED. I haven't had a chance to use it in a live setting yet, but from tinkering around with it, I'm really satisfied with it. I'll probably be writing up a review in the next few weeks/months.
Definitely worth a look into!
http://www.wilsoneffects.com/index.html
(no, I am not sponsored by, nor do I receive any compensation from Wilson Effects... I'm just an effects junky...

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