Pedals that stack with the Randall RD40 Diavlo

pushes an already-dirty tonePushes an already-dirty tone harder and tightens it up. (high gain → mid-forward)

Suhr Shiba Drive pushes a high gain tone toward mid-forward

Goes in front of the amp

pushes an already-dirty tonePushes an already-dirty tone harder and tightens it up. (high gain → mid-forward)

Keeley Red Dirt Overdrive takes that high gain character and pushes it toward mid-forward

Goes in front of the amp

pushes an already-dirty tonePushes an already-dirty tone harder and tightens it up. (high gain → clean boost)

Feed a high gain signal into Beetronics Buzzter Boost Preamp and it comes out closer to clean boost

Goes in front of the amp

sits in the right chain slotPlaced for where it does its job cleanly in the chain, not for a tonal interaction with the anchor. (high gain → shimmer)

Put Electro-Harmonix Deluxe Electric Mistress after Randall RD40 Diavlo in the signal chain, clear of Randall RD40 Diavlo's own gain stage

Goes in front of the amp

sits in the right chain slotPlaced for where it does its job cleanly in the chain, not for a tonal interaction with the anchor. (high gain → lush)

Keep Hungry Robot Moby Dick V2 in Randall RD40 Diavlo's effects loop, clear of Randall RD40 Diavlo's own gain stage — goes in the amp's FX loop (or last, into a clean amp)

Sits in the amp's effects loop

sits in the right chain slotPlaced for where it does its job cleanly in the chain, not for a tonal interaction with the anchor. (high gain → lush)

Keep Randall RD40 Diavlo's high gain voice out front: Meris Mercury7 Reverb goes in Randall RD40 Diavlo's effects loop so its ambient voice doesn't muddy it — goes in the amp's FX loop (or last, into a clean amp)

Sits in the amp's effects loop

shapes the dynamic responseShapes how the tone responds to picking dynamics rather than its frequency or gain.

Crazy Tube Circuits Golden Ratio's own tight character is the real reason this is worth trying

Goes in front of the amp