The EHX Tortion JFET Overdrive/Preamplifier from Electro-Harmonix is a pedal designed with analog JFET technology to reproduce the overdrive and distortion character of a tube amplifier. Three-band EQ and a Pre-Gain switch hone your sound, and a footswitch Boost mode adds a second channel of modern high-gain tones. Normal and Boost mode each has its own Volume and Gain knob.

This pedal features eight knobs. The Normal Gain knob controls the amount of input gain when the pedal is in Normal mode. The Pre-Gain knob controls the level and tone of the initial input signal to the pedal and has four settings: Full and Tight for low input level, and Full and Tight for a higher gain. The Bass knob controls the level of the bass frequency range. The Mid knob controls the level of the middle frequency range. The Treble knob controls the level of the treble frequency range. The Normal Vol knob controls the output level of the pedal when in Normal mode. The Boost Gain knob controls the amount of input gain when the pedal is in Boost mode. The Boost Vol knob controls the output level of the pedal when in Boost mode.