The Overtone Works SweepDrive is unique in the concept of over drive pedals. Play with an enhanced range of expression that an amplifier alone cannot achieve. It allows the guitarist to reach levels of distortion effects on a sloping scale ,while the output level remains balanced and the equalization compensated. SweepDrive provides a three loop routing circuit for integration with other effect pedals and multi-amp rigging. This gives the performer the ability to send the signal to different amplifiers for clean, overdrive, and lead, as well as auto-engage other effect pedals in heel, middle, and toe ranges. Overdrive harmonic content is variable over a wide range with the symmetry control feature, enhancing multi-character ability.