Electro-Harmonix Blurst guitar synthesizer pedal.

• EHX has taken the technology found in keyboards and modular synthesizers and put it into a pedal designed for guitarists and bassists. The Blurst modulates the sound of an instrument like an envelope filter, but instead of the filter response being controlled by playing dynamics, it is controlled by an internal oscillator. The Blurst is a must-have for the adventurous guitarist looking to explore new sonic territory!
• Controls: Volume, mix, resonance, rate, range, envelope mode switch (range / rate / filter), touch divide switch, shape switch).