Simulate the British crunch tube distortion and cabinet of 1960A amplifier Extra amount of gain boost to higher frequency for greater distortion effect. The Booster is a discrete FET preamp pedal with a low impedance output. It is based around the classic preamp side of an Echoplex and produces a shimmering boost tone that adds some high end sparkle and definition is a natural sounding digital/analog delay, with analog direct signal path. has about the same bandwidth as the classic tape echo units, and it can be used in front of an amplifier .