docs
Open Cast

Music and sound effects

Can I get the music as separate stems?

Yes. A generated track comes apart into its parts, and you can re-roll one of them — the drums, say — without touching the rest. The parts on offer depend on the track: a gentle voiceover bed may have no drums to swap.

Where
Swap instruments, on the take you just generated.
Plan
Downloading stems as files needs Plus or Max.
The Swap instruments panel under a generated take: one chip per part of the track — here Leads and FX — with Leads picked. The price counts only what you picked (one part, 5 credits), and the rest of the track is left alone.
Pick the parts to redo. The rest of the track stays as it is.

Re-rolling one part is the answer to "the track is right but the drums are too busy": keep what works, re-roll only what does not. One re-render covers everything you picked, at the price of a single generation.