Janglebox JB Nano Compressor / Treble Booster Pedal The Gain setting adjusts volume and amount of compression. The Attack setting adjusts the level (intensity) of compression The right footswitch is a pre-set treble boost The JB Nano is designed to expand the compression "sweet spot" and not produce any distortion or oscillation. Depending on your amp settings, you should be able to set the Gain and Attack to full volume without creating any "buzz" with your guitar When daisy-chaining a series of additional pedal effects with the JB Nano, we recommend you start by placing it first in the sequence (your guitar should plug into the Nano) in order to take full advantage of its true bypass If you use a 9V battery to power the JB Nano, compression will decrease as the battery wears out. Remove the four screws on the underside of the box to replace the battery