Pedals that stack with the Rocktron Heart Attack Dynamic Filter

Catalinbread Giygas

What Catalinbread Giygas brings here leans toward octave — that's worth building a pairing around

Electro-Harmonix Big Muff Pi

What Electro-Harmonix Big Muff Pi brings here leans toward fuzzy — that's worth building a pairing around

Benson Amps Delay

Keep Rocktron Heart Attack Dynamic Filter's dynamic voice out front: Benson Amps Delay goes after Rocktron Heart Attack Dynamic Filter in the signal chain so its slapback voice doesn't muddy it — goes in the amp's FX loop (or last, into a clean amp)

Boss DD-7 Digital Delay

Put Boss DD-7 Digital Delay after Rocktron Heart Attack Dynamic Filter in the signal chain, clear of Rocktron Heart Attack Dynamic Filter's own gain stage — goes in the amp's FX loop (or last, into a clean amp)