3. AC Adapter Jack Connect a DigiTech PS200R power supply to this jack. Use the proper supply for your area�s Mains line voltage. 4. EQ Knob Controls the boost or cut of high frequencies. Turn this knob clockwise to increase the high frequency content, and counter-clockwise to decrease the high frequency content. 5. Sustain Knob This knob is used to set both the threshold and output gain of the compression effect. Set between the minimum and the 11 o�clock positions, you get mild to medium compression that limits the peak input signals. Set between the 12 o�clock and max positions, you will achieve greater sustain when balancing this control�s setting with the Level control. You can also drive the input of an amplifier harder when this control is turned up which may help to increase distortion. 6. Input Jack Connect your instrument to this jack. Connecting a cable to this jack engages battery power even though the Indicator LED may be off. To prolong battery life, disconnect cables from the pedal when not in use.