Pedals that stack with the Hungry Robot El Castillo Arpeggiating Reverb

MXR Distortion+

MXR Distortion+ leans toward compressed, and that's a real, usable character to pair with

Beetronics Swarm

What Beetronics Swarm brings here leans toward fuzzy — that's worth building a pairing around

Electro-Harmonix Small Stone

Keep Hungry Robot El Castillo Arpeggiating Reverb's harmonically rich voice out front: Electro-Harmonix Small Stone goes after Hungry Robot El Castillo Arpeggiating Reverb in the signal chain so its analog warmth voice doesn't muddy it

Hughes & Kettner Tube Rotosphere MKII The Analog Leslie Simulator

Hughes & Kettner Tube Rotosphere MKII The Analog Leslie Simulator's transparent voice goes after Hungry Robot El Castillo Arpeggiating Reverb in the signal chain — it's not there to compete with Hungry Robot El Castillo Arpeggiating Reverb's own harmonically rich character