Kaiser Mk1 | Dark-Grain Overdrive

Simple single-transistor warm overdrive, borrowing from designs by Joe Davisson (Diode Compression) and Christian Hemmo (Bazz Fuss). There are no controls, just an input and output jack and a 9V battery inside.
The low output makes a pre- or post-gain boost necessary.

Guitar > Kaiser > MOTU 828mk2 > Ableton Live 4.0.3 > Speaker Simulation > Reverb