Description

The Used 3 Leaf Audio Proton V4 is a sought-after envelope filter delivering funky, touch-sensitive sweeps with rich analog character, and this one is in great condition. Dial in everything from subtle vowel-like quack to deep, elastic filter movement using intuitive controls for sensitivity, decay, and filter range, plus level for easy gain matching. Built in a compact stompbox format with standard 1/4" in/out and 9V DC power, it’s a studio-quiet, stage-ready tone machine.

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