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3 Leaf Audio Proton Mk3 Envelope FilterLimited Edition Metallic Gold over 2-Tone White. Only 100 manufactured."The Proton is a modern homage to the classic Mutron III envelope filter. It has a wide frequency response that sounds great with every instrument. Version 3 has increased input sensitivity to work better with low-ouput instruments, and it adds a tone knob for variable control over the filter cutoff frequency."Excellent condition. Some very minor skuffing on the back, but the front and sides are mint. Perfect working order. Really great pedal.
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