The Micro Synthesizer from Electro-Harmonix is an analog synthesizer. It features four completely independent and fully mixable voices: Guitar, Octave, Sub-Octave, and Square Wave. The synthesizer can modify the signals with envelope control for a variety of 'bowed' and 'blown' sounds. In addition, a sophisticated four-slider swept filter control enables you to make highly variable frequency adjustments to the signal. The unit is housed in a tough, compact die-cast chassis and comes with a 9.6 VDC-200BI power supply.