A wah-wah like never before... the probe controller is proximity-dependent just like the other probes. The closer you get, the higher the wah frequency. Fast wah-bles, swirly moans, traditional "chew-wah-wah" sounds... and in the studio, try putting it in an effects loop in the board for a hand-controlled beautifully-timed bandpass manipulator. The Wah Probe features a Super Hard-On circuit as well as the wah so you may drive the input of the wah up to a maximum gain of 60, for crunchy loud lead wah sounds, or set it for precisely matched levels between the wahed and bypassed guitar.

New in late 2000, the boosted wah-wah. Zachary wrote this to me when he announced them :

It's got a theremin antenna control like the other probe pedals. The wah gets brighter when you move your foot closer to the pedal. there's also a super hard-on boost built-in that lets you set the exact volume of the wah, so when you kick it in it will match or boost your signal level... or you can crank it and get a really intense overdriven wah sound. the wah tone is the same one from the seek-wah circuit, but there is no sequencer in this new unit.
The lowest wah setting, when you take your foot away, is set using a screwdriver adjustment on the bottom. there are instructions included with the pedal for setting this level. What I like about it is that when you aren't near the pedal, it goes to a setting that I ship them all with, which is a dull sort of rolled-off tone, like a rhythm sound... when you get near the pedal, the resonance kicks in and you can hear all the harmonics climb sweetly as you approach it... i'm really fond of the tone of that wah circuit. I found myself dawdling today and yesterday while preparing the shipments as I tested each pedal and played parts of songs through them and suddenly realized 10 minutes had gone by. having no rocker pedal makes it really easy to do that fast wah stuff you hear really strong players use on 70's records... strumming a chord just as you pull your foot back and then tap the pedal several times in a row makes this really neat "chew-wah-wah-wah" sound. i could never effectively get that "chew" sound of the wah falling just as the pick struck before. I didn't think this pedal would be as fun as it is! another cool thing that's different from regular wahs is that you can waggle your foot as you wah, giving your guitar a swirly sort of rotating wah sound, which you can't get with a rocker pedal. and the boost can get shockingly loud if you want, and really cracks up the wah... it's driving the input of the wah instead of boosting the output, so it makes that single-transistor circuit really go into snappy class-a distortion when you crank up the boost. It makes my plexi marshall absolutely 'splode. i'm sure my neighbors want me to move out immediately... this summer was kind of quiet, but now i have been wah-ing my brains out.