Foxx Wa Machine
The Foxx Wa Machine is a wah pedal that uses an optical sensor rather than a traditional potentiometer to control the filter sweep. Its treadle position is detected by a light-sensitive circuit, which alters the frequency of a resonant band-pass filter, producing the characteristic "wah" effect as the pedal is rocked. The unit includes a switch to engage or bypass the effect, and it operates on battery power. Its distinctive optical mechanism provides a smooth, continuous sweep without the mechanical wear associated with conventional wah pedals.