The Fuller Drive with Boost is a double Pedal with the Fuller Drive and the Clean Boost. The Fuller Drive is a FET driven overdrive to make your amp sound like a cranked vintage British amp. From very low gain (almost clean) to cranked overdrive. A very natural and touch-sensitive pedal, which cleans up when you turn your guitar volume down. Works great with any guitar and amplifier. If you’re playing in a small venue and you’re not able to crank up your amp, this is the pedal to go. Opens up and widens your sound. You don’t want to turn it off again. The Clean Boost is a very clean boost with lots of volume and headroom. Great to overdrive tube amps. The pedal doesn’t overdrive by itself, but since the Clean Boost has about +20db of gain, it easily overdrives the input stage of your tube amp.It’s very clean and supports the character of your guitar. It boosts treble and bass slightly to open up your sound for more definition, specially with cranked tube amps. It sounds great with bass guitars. There’s one problem with this pedal: once it is on, you don’t want to switch it off again. I’m very sorry for that. Handbuilt in Switzerland, True Bypass, Switchcraft plugs, aluminium knobs, matched and biased FET-transistors, Controls:Top Boost: lifts Treble, a bit like the old AC30’sBass Cut: 3-way switch, cuts the subs for a tighter sound, especially with bigger amps.Drive: from clean to cranked.Volume: Interactive with Drive, it’s like Pre and Post volume of some tube amps.Tone: from dark to very bright.Boost: Volume of the Clean Boost Handbuilt in Switzerland, True Bypass, Switchcraft plugs, aluminium knobs, matched and biased FET-transistors, Pre/Post Switch: Pre – Boost’s before the Overdrive for more Drive, Post – Boost after the Overdrive for more Volume. Both pedals work individually. Works with normal 9V ac/dc adapter (negative tip) like 1Spot 9V adapter or Boss PSA 9V adapter (not included).