Pedals that stack with the Boss SD-1 Super OverDrive

ZVEX Fuzz Factory

ZVEX Fuzz Factory stacks fuzzy on top of the mid-forward already here

Fjord Fuzz Berserk

Fjord Fuzz Berserk layers fuzzy onto an already mid-forward signal

Hughes & Kettner Tube Rotosphere MKII The Analog Leslie Simulator

Keep Hughes & Kettner Tube Rotosphere MKII The Analog Leslie Simulator after Boss SD-1 Super OverDrive in the signal chain, clear of Boss SD-1 Super OverDrive's own gain stage

Ashdown Velvet Compressor

Ashdown Velvet Compressor's own compressed character is the real reason this is worth trying

Dunlop - MXR Carbon Copy Deluxe Analog Delay

Keep Boss SD-1 Super OverDrive's mid-forward voice out front: Dunlop - MXR Carbon Copy Deluxe Analog Delay goes after Boss SD-1 Super OverDrive in the signal chain so its analog warmth voice doesn't muddy it — goes in the amp's FX loop (or last, into a clean amp)

Caroline Guitar Company Kilobyte

Caroline Guitar Company Kilobyte's pristine voice goes after Boss SD-1 Super OverDrive in the signal chain — it's not there to compete with Boss SD-1 Super OverDrive's own mid-forward character — goes in the amp's FX loop (or last, into a clean amp)