Chris Mac Gregor
This is an innovative dual function pedal. The effect of modulation is deeper and much wider than with common wah pedals.
The "travel" of the treadle is divided in 3 parts:
In the first part (when the pedal is down or almost down) the effect is bypassed. The second part simulates vowels (I O U) and the third part is a wah function allowing a variety of sounds by changing the "HI & Q" knob, used to determine the bandwidth and saturation of the filter.