Electro Harmonix - Qtron Plus (Strat) - YouTube
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Electro-Harmonix Q Tron Envelope Controlled Filter guitar pedal, with original wooden box
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Q-Tron Plus | Envelope Filter with Effects Loop - Electro-Harmonix
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Electro-Harmonix Q-Tron Plus - ranked #14 in Filter Effects Pedals | Equipboard
USED Electro-Harmonix Q Tron Plus w/ Original Box - Envelope Filter with Effects Loop - Matt's Music Center
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