Electro-Harmonix RiddleElectro Harmonix Riddle: Q Balls for Guitar Envelope Filter The Electro Harmonix Riddle is a powerful and precise envelope filter fine tuned for guitar frequency response. Sculpt your envelope to reveal a truly expressive tone, with a defined and unique signature. Riddle 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
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