Back by popular demand the MXR flanger creates a variety of wild sounds from dynamic jet plane or cool space effects to short delay, chorus and vibrato. Back off Width to zero to disengage auto-sweep, then use the Manual knob to physically place the effect anywhere along the frequency spectrum. Great for guitar, bass keyboards or vocals! Controls: > Footswitch toggles effect on/bypass (red LED indicates on) > Manual knob selects frequency center of effect when auto-sweep is disengaged > Width knob at zero disengages auto-sweep, rotates clockwise to increase the total phase sweep of effect > Speed knob modulates rate of effect Regen knob feeds effect back onto itself at adjustable intensity, increasing the total phase effect. Power: Two 9 volt batteries or the included Dunlop ECB-004 18-volt AC adapter.