The Supro Tremolo accurately recreates the iconic modulation effects found in American amplifiers of the 1960s. With both Amplitude and Harmonic modes, the all-analog Supro Tremolo allows players to switch between swampy tremolo sounds and psychedelic modulating tones. The Supro Tremolo features preamp and power amp sections, including an actual output transformer deployed to recreate the magnetic saturation characteristic of historic Supro amps. Along with modulation controls for Speed and Depth, the Supro Tremolo provides Gain control with automatic output level compensation. Additionally, the pedal features an assignable Expression pedal control to adjust the Speed function. Runs on 9-18VDC.