The Presence knob controls the extreme high frequencies, the Low knob controls the level of the lower frequencies, the Middle and High Level knobs boost or cut their respective frequencies and the Level knob controls the output volume level (from -18dB to +18dB). The Middle and High knobs also feature individual Frequency knobs to shift the centre frequencies (100hZ to 1.6kHz for Middle and 500hZ to 8kHz for High). Very good condition, includes original box. All prices include secure and sturdy packaging to ensure your pedal arrives safely. A ll our domestic orders are sent via Australia Post.Within Australia, along with additional options for. We also offer both Express and Courier (via EMS) services if you need your pedal in a hurry. All pedals are thoroughly tested here and we'll do our best to list any known troubles in the condition section above. Visit mojostompboxes for discounted prices on all our gear along with our other services including repairs, modifications, demo videos and more! This item is in the category "Musical Instruments\Guitars & Basses\Parts & Accessories\Effects Pedals\Other Guitar Effects Pedals". The seller is "mojostompboxes" and is located in this country: AU. This item can be shipped worldwide.