Guyatone Mighty Micro Wah Rocker Level: Adjusts output volume when effect is engaged. Turn clockwise to increase volume. Decay: Adjusts Decay time of filter sweep. Turn clockwise the lengthen time of filter sweep. Threshold: Adjusts the effect sensitivity to input signal level. Turn clockwise for more sensitive response at lower input level. Blend Switch: Selects Effect only or Effect/Dry blend. Response: Adjusts Attack time of filter. Turn clockwise to delay wah starting response.