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When it comes to variable pulse width fuzz, the buck stops with Trek. This pistol of a pedal converts incoming signals into square waves, which it presides over with a duty cycle control. All of the pedal's functions have been siphoned down into six conveniently-located front panel controls, the two most essential being Volume and Range. Volume increases the output signal, Range dictates the duty cycle (this parameter can also be controlled using a 10k TRS expression pedal or 5v control voltage to achieve pulse width modulation).