The EHX Bass Micro Synthesizer is a pure bass guitar synthesizer with all analog circuitry. Adjustable synth parameters deliver fat, sweet tones from another world. Its voice mix section lets you bring in 4 different voices: Sub Octave, Guitar, Octave, and Sqaure Wave. The Square Wave gives the Bass Micro Snythesizer its signature, fuzzy growl that calls back to the cosmic '70s . An Attack Decay control creates bowed effects or ominous volume swells while the Filter Sweep section sweeps through the full frequency spectrum for sound from quick high to low chops and slow low to high blooms.