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Source Audio SA143 Soundblox Pro Bass Envelope Filter Pedal | Cream City Music
Macrodose® Envelope Filter - AllPedal
Amazon.com: MOOER Envelope Analog Filter Dynamic Auto Wah Pedal, Exaggerated slap back funk, Subtle sultry abience, Static frequency filter effects for Guitar and Bass : Musical Instruments
MXR M82 Bass Envelope Filter Pedal Bundle with Blucoil Slim 9V Power Supply AC Adapter, 2-Pack of 10-FT Straight Instrument Cables (1/4in), 2x Patch Cables, and 4-Pack of Celluloid Guitar Picks -