ZVEX EFFECTS Vexter Wah ProbeThis effect is a natural continuation of the probe series the Fuzz Factory probe, the volume control manual tremolo probe, and now a wah. Its probably exactly what you think it is: a theremin style antenna controlling a wah, getting brighter as your foot approaches. It has three extra features, however. Theres a Super Hard On boost circuit in front of the wah, with a knob to set the exact level of boost for driving your wah sound. It can be turned up