Pedals that stack with the Blackstar Unity Bass U250

Fulltone OCD Obsessive Compulsive Drive

Fulltone OCD Obsessive Compulsive Drive stacks fuzzy on top of the mid-forward already here

Electro-Harmonix Triangle Big Muff Pi

Electro-Harmonix Triangle Big Muff Pi's own sustaining character is the real reason this is worth trying

Wren and Cuff Box of War OG

Run mid-forward into Wren and Cuff Box of War OG for more fuzzy on top

Fuzzrocious Cosmic Bull Shark

Put Fuzzrocious Cosmic Bull Shark after Blackstar Unity Bass U250 in the signal chain, clear of Blackstar Unity Bass U250's own gain stage

Wren and Cuff Gold Comp

Wren and Cuff Gold Comp's own germanium character is the real reason this is worth trying

Fjord Fuzz Mime

Keep Blackstar Unity Bass U250's compressed voice out front: Fjord Fuzz Mime goes in Blackstar Unity Bass U250's effects loop so its dark voice doesn't muddy it — goes in the amp's FX loop (or last, into a clean amp)

Strymon El Capistan

Run Strymon El Capistan in Blackstar Unity Bass U250's effects loop, clear of Blackstar Unity Bass U250's own gain stage — goes in the amp's FX loop (or last, into a clean amp)