The George Dennis GD55 effects pedal works as either a wah pedal or an overdrive pedal. In the Wah-Wah mode, the Wah-Overdrive pedal works by applying a high-gain band pass filter to the signal, the resonant frequency of the filter being controlled by the position of the guitar pedal. Rocking the pedal back and forth produces the distinctive Wah-Wah effect. In the overdrive mode, the color of overdrive is now controlled by the position of the pedal.
- Dual function wah/overdrive pedal
- Overdrive, volume, and contour controls
- High-gain band pass filter