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Sculpt your envelope to reveal a truly expressive tone, with a defined and unique signature. The EHX Riddle Envelope Filter will deliver tight and smooth control over the complete 80 Hz to 5 kHz range, with a consistent and even sweetness. Need some edge Engage Riddle's analog distortion and dial in anything from subtle bite to dominating crush. You can even plug in an optional expression pedal to control the filter sweep with your foot. With the ability to adjust Q, sweep range, and filter type, you'll also wind up with of the most versatile wahs available.