Pedals that stack with the Electro-Harmonix Nano Operation Overlord

Soldano SLO

The transparent tone has headroom to spare — Soldano SLO gives it high gain to fill it with

JHS Smiley

Into a transparent tone, JHS Smiley brings the fuzzy it's missing

Walrus Audio Monument CS

Walrus Audio Monument CS's low gain voice goes after Electro-Harmonix Nano Operation Overlord in the signal chain — it's not there to compete with Electro-Harmonix Nano Operation Overlord's own saturated character

Vox Valvenergy Silk Drive

What Vox Valvenergy Silk Drive brings here leans toward smooth — that's worth building a pairing around

Mr. Black Bloodmoon

Keep Electro-Harmonix Nano Operation Overlord's saturated voice out front: Mr. Black Bloodmoon goes after Electro-Harmonix Nano Operation Overlord in the signal chain so its dark voice doesn't muddy it — goes in the amp's FX loop (or last, into a clean amp)

Boss DD-3 Digital Delay

Put Boss DD-3 Digital Delay after Electro-Harmonix Nano Operation Overlord in the signal chain, clear of Electro-Harmonix Nano Operation Overlord's own gain stage — goes in the amp's FX loop (or last, into a clean amp)