Pedals that stack with the MXR Phase 90

Phase 90's classic swirl and the Borderland's ambient reverb both live in the modulation-and-space category, not gain. — goes in the amp's FX loop (or last, into a clean amp)

Comes later in the signal chain

Run the Phase 90's classic sweep after the Colosseum's harmonic, versatile gain and the modulation has real body to color.

Comes earlier in the signal chain

Run the Phase 90's classic sweep after the Octamizer's glitchy octave tracking and the modulation picks up that pitch-shifted texture.

Comes later in the signal chain

Layer the Phase 90's organic sweep after the Fallout Cloud's boutique silicon fuzz for classic-rock movement on an already-textured signal.

Comes earlier in the signal chain

Run the Phase 90 after the Octaurus so its classic sweep rides the octave fuzz's shimmer instead of a clean tone.

Comes earlier in the signal chain