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
MXR Envelope Filter Kit | Effect Pedal Kits
Experimentalists Anonymous DIY Archives
DISC DOD Envelope Filter 440 Effect Pedal | Gear4music
pedal' in DIY Music & electronics, Page 2 | Scoop.it
Envelope Filter & Fixed Wah – Build Your Own Clone