A classic Japanese guitar effect – the Shin-Ei Companion Fuzz – it has its roots in the Fuzzrite, with a notch filter at the output.
SHIN-EI COMPANION FUZZ FY-2 – VERO LAYOUT
FY-2 SCHEMATIC
Usual notch filter response.
It’s a fairly broken-looking wave – not the infamous volume drop compared to the input level, which is normally fixed by adding a gain recovery stage.
