Donner Dynamic Wah-Wah Pedal Filter EffectDonner Auto Wah Pedal Features Power Supply9V DC (Negative in the center). Res KnobControl the filter sharpness. Sens KnobControls the sensitivity. Decay KnobControl the filter frequency falls back to the resting point. Range KnobAdjust the filter frequency range. Input & Output JackAnalogy though 1 4 mono audio jack. LED LightLED indicator shows the working state. Full metal shellAluminum alloy classic, stable and strong. True BypassTrue bypass for
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