Class-A FET Overdrive

Circuit Design by Christopher Venter of SHOE Pedals
Discrete FET Class-A Design
Dual Gain Stages selectable via toggle switch
Hybrid Pre- and Post-Gain Bass and Treble Controls
Input Filter control to tame overly-bright guitars
Internal DIP switches to reduce unwanted effects of overly-bright signals and buffers
True bypass
9V Power Supply jack
Aluminum chassis

https://www.digitech.com/distortion-overdrive-fuzz/DOD-LOOKINGGLASS.html