Pedals that stack with the Boss XS 100 Poly Shifter

Fjord Fuzz Odin

The Odin's doom-heavy stoner fuzz gives the XS 100's subtle pitch shifting a genuinely dense, saturated signal to divide.

EarthQuaker Devices Dirt Transmitter

Stack the Dirt Transmitter's low-noise gain with the XS 100's own subtle, whammy-style pitch shifting for a driven signal with real harmonic layering.

Electro-Harmonix XO Deluxe Memory Man

Run the Memory Man's lush analog echo after the XS 100's subtle, whammy-style pitch shifting and the repeats carry the harmonic layers forward. — goes in the amp's FX loop (or last, into a clean amp)

Alexander Pedals SpaceXpander

Put the SpaceXpander after the Poly Shifter so the reverb tail sits under the harmonized notes instead of smearing the pitch tracking. — goes in the amp's FX loop (or last, into a clean amp)