Feel the response and attack of your rig... The Thorndal Duane â69 is a two in one pedal. Left switch is a boost - clear and transparent. Dial it back to get a minus boost or crank it to get an amp-like boost. Right switch is the overdrive - extremely organic and dynamic. What make the Duane â69 dynamic and versatile are the Tone, Voice and Input controls. Tone - Treble cut. Dial it clockwise to cut the treble.Voice - Bass cut. Dial it clockwise to cut the bass.Input - Volume & low-mid regulator. Use it to match the Duane â69 to the pickups you use on your guitar. It is a brilliant knob, we loved it. Gregor Olbrich is the mind behind Thorndal. The guitar builder was desiring a boost/overdrive that alters your core tone as little as possible. We think itâs mission accomplished!Little advice: The Duane â69 operates on battery or on regulated 9-18 Volt adapter. Thorndal recommends to feed it with 12 Volt for maximum satisfaction, which is how the TonePedia demos were recorded.