Exit Index is an all-analog warped tremolo and tube-style overdrive that responds to input levels dynamically. Tremolo is cool but usually safe. This pedal pushes tremolo somewhere strange. Violent, Leslie-like thump. Reverse delay-like sounds. Ambient, psychedelic swirls with minute variations in the tempo of the LFO. Hit it hard and hear the tremolo only in the decay. Play softer and let the whole sound get affected. Or turn up the Blood knob and let things get really strange and aggressive. In addition, it has expression in and internally works off of 18v for extra headroom while only requiring 9v to be powered.