Pedals that stack with the Mad Professor 1 Overdrive

Source Audio Mercury Flanger

Put Source Audio Mercury Flanger after Mad Professor 1 Overdrive in the signal chain, clear of Mad Professor 1 Overdrive's own gain stage

Electro-Harmonix Green Russian Big Muff

Electro-Harmonix Green Russian Big Muff leans smooth right where the bright tone needs it

Boss OD-1 Overdrive

Where this leans bright, Boss OD-1 Overdrive answers back smooth

J. Rockett Jrad Squeegee Compressor

What J. Rockett Jrad Squeegee Compressor brings here leans toward transparent — that's worth building a pairing around

FoxGear EchoSex

Keep FoxGear EchoSex after Mad Professor 1 Overdrive in the signal chain, clear of Mad Professor 1 Overdrive's own gain stage — goes in the amp's FX loop (or last, into a clean amp)

Eventide Modulated Delay

Keep Mad Professor 1 Overdrive's bright voice out front: Eventide Modulated Delay goes after Mad Professor 1 Overdrive in the signal chain so its modulated voice doesn't muddy it — goes in the amp's FX loop (or last, into a clean amp)