When a demo video’s bed is close but not shippable, I used to regenerate from zero. That “fixed” length sometimes and broke everything else. These days I treat soundtrack work like a small build loop with three distinct ops: extend, regenerate, and section edit. Mixing them up wastes cycles.
Workspace: Doremi. Tools that map cleanly to those ops: AI Music Extender and AI Music Editor.
Decision table (what I actually use)
| Symptom | Prefer | Avoid |
|---|---|---|
| Motif good, cut is longer | Extend | Full regenerate |
| Length OK, one region fights VO / SFX | Section edit | Extending again |
| Direction is wrong (mood / genre / vocal) | Regenerate (or remix elsewhere) | Patching forever |
| Need a short loop to grow into a bed | Extend from a keeper loop | Stitching abrupt hard-cuts by hand |
Loops themselves are a standard idea in production—repeating sections used as building blocks (Loop (music) on Wikipedia). Generative tools just make “grow this loop” a first-class action instead of a DAW chore.
Extend: grow without losing the skeleton
Prompt shape that works:
- State target length or “enough for a ~40s UI tour.”
- Name what must stay (pulse, no vocal, soft density).
- Explicitly forbid a new chorus / hook if you need a bed.
I listen against the timeline, not headphones alone. If the extension introduces a mid-track “second song,” I re-run with “continue the same texture, no new theme.”
Section edit: surgical replace
When only bars 12–18 are wrong, full regenerate is the expensive option. The editor path: select the region, describe the replacement (“quieter, less high-end, keep drums light”), keep surrounding material as context. Two variants max; A/B under narration.
This is closer to a code patch than to “generate me a soundtrack.” Acceptance criteria first, then the tool.
Regenerate: when the ticket is wrong
If the brief itself changed (“trailer energy” → “under soft narration”), stop patching. A new seed is cheaper than three failed extends. Generative music as a concept is system-driven variation under constraints (Generative music); your constraints still have to be honest.
Builder notes
- Write invariants like tickets: BPM feel, vocal yes/no, speech-safe density.
- Cap candidates. Choice fatigue recreates the free-BGM scavenger hunt.
- Keep a scrap of winning prompts next to the repo (extend vs replace wording differs).
- Ship internal reviews with “good enough under VO”; polish later if the project warrants it.
Not a music-theory deep dive—just the shortest path I’ve found from “14s keeper” to “matches the cut” without another lottery roll. If you have a cleaner acceptance checklist for short beds, I want to steal it.
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