AMZ-FX Guitar Effects Blog » Blog Archive Dr. Quack Envelope Filter mods - AMZ-FX Guitar Effects Blog
The Quackmire: A simpler vactrol LP envelope filter for 1590A
TG-Music DOD FX25 clone DIY project
Envelope Circuits: a simple AR design using op amps | synthnerd
The FX25 was initially produced by DOD in the early 80s and is an OTA-based envelope filter/auto-wa… | Diy guitar pedal, Guitar distortion pedal, Guitar pedals