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Electro Harmonix Nano Q-Tron Envelope Filter – Thomann United States
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Electro-Harmonix Q-Tron Envelope Filter Guitar Effect Pedal Used + Adapter | eBay
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Electro-Harmonix Q-Tron Plus Envelope Filter with Effects Loop (EHX Pedal Demo by Dave Weiner) - YouTube
Electro-Harmonix Q-Tron Envelope Filter | Reverb
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Q-Tron (Original) - Electro-Harmonix Q-Tron (Original) - Audiofanzine
