G-Lab Dual Vintage Overdrive DVO The Dual Vintage Overdrive is a full analog foot preamp suitable for every guitar player. As well beginners as advanced players or even professional musicians are searching for the New, the Best and the Unique tones of their guitars. Everybody will find not just one tone but tones of new tones – very special for themselves. More, the guitar player will be able to easily and quickly switch between 3 tone-presets: on 2 channels with individually adjusted overdrive and choose one mode from: SOLO, CLEAN or BYPASS. It is recommended to connect DVO to power amplifier ( if the amp has effect loop then connect to RETURN connector). In this case the tone will depend on the amps PRESENCE control. DVO preamp sounds very good with Celestion Vintage 30 speakers.