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Rare, discontinued wonderful filter.Excellent condition - fully calibrated, with power cable and knurlies.Salty, resonant diode filter.Neptune is a resonant diode ladder filter designed by Winterbloom in collaboration with Carson Walls. It's intended to bring together sound and modulation into a complete, distinct synthesizer voice. Unlike typical multi-mode filters with separate modes or outputs, Neptune instead has separate low-pass and high-pass inputs into a single filter core. It's coupled with a feedback-modulated distortion circuit called salt that opens up a wide range of tonal possibilities from tame to dirty to outright chaotic.