ISP Technologies Theta Pre-Amp Pedal, pre-distort preamp usable for overdrive of distortion circuit or for clean tone shaping / overdrive, incredible tone shaping with pre-distort tone includes bass mid level mid sweep from 300 to 3KHz and treble,, THETA distortion circuit with post distort bass mid level mid sweep from 300 to 3KHz and treble, highest gain distortion available anywhere, greater than 160dB of gain using distortion and pre-distort preamp overdrive, Decimator G-string II noise reduction built in for absolute silent operation and greater than 80dB NR, footswitch selectable dual Gain1 / Gain2 settings, +/-15volt internal operation for professional headroom and sonic clarity, dynamic saturation modulation circuit emulates a saturated tube amp with tube rectifier, externally controllable switching of all footswitch functions for control via MIDI control function, incl. 9 Volt AC power supply