Pigtronix Keymaster

Pigtronix Keymaster is a dual, true bypass FX loop pair that can be run in series or parallel. This intuitive, impedance matching device will route any signal into pedals and then back out to any where else. The Keymaster opens up new worlds of tone from the effects pedals you already own.
Keymaster lets a musician crossfade between different effects (or entire pedal boards) with a standard expression pedal. The Keymaster also allows you to add an expression pedal controlled Blend function to your favorite delay pedal or any other effect. A player can turn effects off gradually this way for smooth transitions between tones. Blend two crunch pedals together in parallel to achieve the ultimate thick wall of sound.