The Syle Green Filter- Synth Envelope Filter

via this auction

"The Syle Green Filter pedal. This is a very interesting and fun filter with a ton of weird sounds- not your traditional envelope filter. More like a synth pedal, with a fuzz included in the filter sound. This pedal is used and is cosmetically in excellent condition. I have noticed that when using this with my active basses there is a "popping" sound when the filter engages. The sound is not present when I used my passive instruments. I'm not sure if this is a manufacturing defect or a design flaw, and because of this I am selling the pedal AS-IS."