Electro-Harmonix Nano Overlord Overdrive Guitar Effects Pedal

From the listing

Seller's description

A nano-sized version of the Operation Overlord with the same great overdrive and distortion tones, but in mono for those who don’t require stereo ins/outs. It’s super versatile and ready for your axe be it guitar, bass or keys. The Nano Overlord is switchable between two modes: Normal and Boost. Normal mode provides low to medium gain sounds and relies on three amp-like JFET gain stages. When Boost mode is engaged it’s like adding a pedal-type OD circuit in front of the JFET stages to really increase overall distortion. The pedal also features a Dry blend control which is invaluable for bass and keyboards, a 3-position input level selector switch and an active 3-band EQ.