ElevenLabs Music inpainting: redo one section vs a new Sume take

ElevenLabs Music v2 and v2.5 support inpainting: you select a section of a generated song and regenerate only that part. Sume has no edit or inpaint call, so a fix means a new generation, or a second short track spliced in with Timeline.

What ElevenLabs documents

The capabilities page says inpainting lets you select a specific section and regenerate just that section without affecting the rest, with v2 and v2.5 supported and quality improved in v2 (read 2026-10-02). It describes the feature in the ElevenMusic interface and gives no API steps for it (read 2026-10-02). Its changelog also lists v2.5 composition plans of up to 6,132 characters and 30 lines of 200 characters (read 2026-10-02).

Doing the same fix on Sume

Treat the song as sections. Generate the full track, listen, then write a short brief for the part you want different, and generate that as its own track. Use the prompt's section markers, like [0:20-0:30] Breakdown:, to describe where it should sit.

Then assemble in Timeline 1.0. The spine and soundtrack take whole files, and audio.parts[] slices with source_in and duration can join up to 20 gapless pieces. That lets you join the good first half with a regenerated second half.

Honest limits

The join is a cut, not a crossfade inside the music. A key or tempo mismatch will be audible, so give both briefs the same BPM, key and instruments.

Every accepted generation is billed at the fixed Music price, so a section fix costs another full generation. If section-level editing is central to your workflow, a vendor with an inpainting UI fits better.