Pedals that stack with the Ernie Ball VP Jr Volume Pedal

Fjord Fuzz Odin

The low gain tone has headroom to spare — Fjord Fuzz Odin gives it fuzzy to fill it with

EarthQuaker Devices Dirt Transmitter

Run EarthQuaker Devices Dirt Transmitter into that low gain platform and it finally gets some fuzzy

Alexander Pedals SpaceXpander

Keep Ernie Ball VP Jr Volume Pedal's low gain voice out front: Alexander Pedals SpaceXpander goes after Ernie Ball VP Jr Volume Pedal in the signal chain so its spring voice doesn't muddy it — goes in the amp's FX loop (or last, into a clean amp)

Red Witch Titan

Run Red Witch Titan after Ernie Ball VP Jr Volume Pedal in the signal chain, clear of Ernie Ball VP Jr Volume Pedal's own gain stage — goes in the amp's FX loop (or last, into a clean amp)