Keeley Neutrino Envelope Filter Pedal KNEUT-U B&H Photo Video
Custom Double Mutron III "Jerry's Briefcase" Envelope Filter, A la Bootsy Collins, Jerry Garcia! | Reverb
Pedal Genie | Keeley Electronics Neutrino Envelope Filter | All Your Pedal Wishes, Granted
Unpacking The Envelope Filter - zZounds Music Blog
Anyone figure out the best settings for Jerry Garcia's sound on the Micro-Tron iii? I can't quite nail it. Estimated Prophet would probably be the best example song. : r/guitarpedals
Vintage Electro-Harmonix - Q-TRON - Envelope Filter - Jerry Mod - 1st Version | Reverb