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. LO Band Knob Controls the compression amount of the frequencies below the X-OVER knob�s setting. Turning this knob clockwise increases the amount of compression and level of these frequencies. Lower settings help control peaks while higher settings greatly emphasize these frequencies. Creative use of this knob in conjunction with the HI BAND, X-OVER and LEVEL knobs makes the Bass Squeeze a useful tool for both dynamics processing and bass tone manipulation. 5. HI Band Knob Controls the amount of compression of the frequencies above the XOVER knob�s setting. Turning this knob clockwise increases the amount of compression and level of these frequencies. Lower settings help control peaks while higher settings greatly emphasize these frequencies. Creative use of this knob in conjunction with the LO BAND, X-OVER and LEVEL knobs makes the Bass Squeeze a useful tool for both dynamics processing and bass tone manipulation.