The controls are as follows:
Volume – Controls overall output.
Presence- Controls higher range frequency.
Bass – Controls low end frequencies.
Treble – Controls high end frequencies.
Gain – Controls overall gain of the pedal.
Focus – Controls sub bass range response.
Plug in, turn it up and rumble some guts.
Like all PLX FX pedals, this pedal is a true bypass, so there is no coloration to your sound when it’s turned off. It utilizes a standard 9v 2.1mm power adapter and NO battery snap.