Source Audio Zio Analog Front End + Boost Pedal Effect Pedal - UsedThe Source Audio ZIO is a Preamp and Boost pedal that allows you to choose between 4 different voicings. The pedal features two switches, one for a tone control (Bright, Med, Dark), and the other for the option of having the pedal always on with a mute switch or running it like a traditional pedal. The ZIO is capable of boosting your signal by 20dB. This pedal is in very good condition with a couple of small nicks in the paint on the top of the casing.