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Electro-Harmonix Q-Tron Envelope Controlled Filter Pedal – Bass Workshop- Sales, Setups, Services & Repairs.
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Electro Harmonix Q-Tron Plus Envelope Filter - Guitar Pedal with Effects Loop (QTron+) - 683274010670
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USED Electro-Harmonix Q Tron Plus w/ Original Box - Envelope Filter with Effects Loop - Matt's Music Center
![my (probably) complete board! ordered the q-tron about 4 months ago and it finally came in last night :) : r/basspedals my (probably) complete board! ordered the q-tron about 4 months ago and it finally came in last night :) : r/basspedals](https://preview.redd.it/2pes6whhd8v71.jpg?auto=webp&s=b6c1e94a4f68820745876449bd8bcb054652f015)