AI temp track replacement: generating music for a rough cut
September 18, 2026
AI temp track replacement is the practice of generating an original instrumental cue for a rough cut instead of dropping in a copyrighted recording. A generated temp from a model trained on licensed data carries no sync or master-use obligation, so the cue can survive into a screener, a festival submission, or a distributor review without a clearance gap.
Key takeaways
A temp track is a placeholder cue an editor drops into a working cut, and it is almost always someone else's copyrighted recording.
Generated temp cues remove the clearance exposure. They do not remove the creative dependency.
Stable Audio 3.0 sets cue length in seconds and regenerates named regions of an existing cue by timecode.
Why a temp track becomes a liability
A temp track costs a production nothing until the cut leaves the building. Temp tracks have been standard practice since the late 1960s, when directors began dropping pre-existing recordings into a working cut to see how a scene might play with music. Two problems follow, and only one gets discussed.
The creative problem has a name. Temp love describes the point where a director has watched a scene so many times against a borrowed cue that no original score displaces it. Editors also call it tempitis, or scratch track fever. A composer then gets asked to write close to the temp without copying it, which is a worse brief than the one they started with.
The second problem is contractual. A temp cue is usually a copyrighted master used with no sync license and no master-use license, which is free while the file sits in the edit suite and stops being free the moment it moves.
Teams who refuse to temp still hit the second problem. The editors of Vince Gilligan's Pluribus told Art of the Cut in May 2026 that they do not temp at all, then described putting temp score into the first episode for the studio presentation, because they wanted the strongest possible first showing.
What clearance review actually checks
The Sundance Film Festival submissions FAQ permits temp tracks, scratch music, and temp scores, provided the filmmaker lists missing or temporary elements on screen before the film begins. However, Sundance's terms and conditions require the submitter to warrant that exhibition will not infringe any copyright and that all license and clearance fees have been and will be paid.
Distribution is where the cue sheet gets read closely. Errors and omissions carriers review the music cue sheet during underwriting and can decline coverage or exclude specific cues where clearances are missing, and a distributor cannot close a sale on a film with a defective chain of title. Broadcasters and streaming platforms run their own clearance review before acquisition.
The sequence matters for anyone deciding when to worry. A temp cue may be tolerated at submission with disclosure but becomes a blocking item when trying to sell the film. Temp love is most expensive exactly there, because the replacement conversation now runs against a delivery deadline, with a composer who has to beat a cue the director has heard four hundred times.
Generating a cue to the length of the scene
Duration is a parameter in Stable Audio 3.0 rather than a trim. Generation takes a length in seconds and builds the cue to it, up to 120 seconds on the Small models and up to 380 seconds on Medium and Large. An editor with a 94-second sequence asks for 94 seconds and gets a cue that resolves at the end, instead of a two-minute track faded out under the last shot.
Speed changes how the cue gets used. Stable Audio 3.0 Medium generates 380 seconds of audio in 1.31 seconds on an H200, and Small produces 120 seconds on a Mac CPU in under six seconds with no GPU. Generating eight variations for a spotting conversation is a matter of seconds, which turns the cue from a commitment into an experiment.
Local operation matters more here than the spec sheet suggests. Small and Medium weights run on CPU, CUDA, and Apple Silicon, so an assistant editor can generate against unreleased footage on a machine inside the cutting room. No picture and no scene description leaves the facility. Productions under NDA rarely get that option from a hosted service.
Recutting music after the picture changes
Inpainting addresses the failure that ends most music-to-picture workflows: the edit changes after the cue is built. Stable Audio 3.0 takes an existing audio file and a timecode range, regenerates only that range, and leaves the rest intact. The parameters are literal seconds, inpaint_mask_start_seconds and inpaint_mask_end_seconds, so an editor who loses four seconds at 00:32 regenerates 32 to 36 rather than re-rolling the cue and losing everything that already worked.
Multiple regions go in a single pass. Passing a list to both mask parameters regenerates several non-contiguous sections at once, which matches how notes actually arrive: four fixes scattered across a sequence, not one.
Continuation extends a cue past its original end. Setting the mask start to the length of the source file and choosing a longer duration carries the existing material forward, covering the case where a scene grows in the recut. The Stable Audio 3.0 prompt guide covers how much context to leave around a masked section.
Experimental stem generation and export exist in the Stable Audio web app. Stems give an editor control over what sits under dialogue, and the experimental label is worth taking at face value on a delivery schedule.
| Post stage | What a Stable Audio 3.0 generated temp cue does | What it does not do |
|---|---|---|
| Assembly and rough cut | Fills the scene at exact length, generated in seconds | Respond to picture; the editor describes the scene in text |
| Screener and festival submission | Travels with no sync or master-use obligation attached | Remove the need for on-screen disclosure of temporary elements |
| Recut after notes | Regenerates only the affected timecode range | Preserve a specific musical moment across a regeneration |
| Picture lock and spotting | Gives the composer a brief that is safe to imitate | Replace a spotting session or a composer's judgment |
| Final mix and delivery | Clears without a rights holder to negotiate with | Guarantee copyright registrability of the cue |
Where AI temp replacement stops working
Stable Audio 3.0 does not watch the cut. Generation runs from a text prompt and a duration with no video input, so the model has no knowledge of where the door slams or where the reveal lands. Some competing tools accept a video file and compose against its motion and pacing. An editor working with Stable Audio 3.0 describes the scene rather than uploading it.
Output is instrumental. Music and sound effects, no vocals, which fits score and rules out generating a needle-drop song.
Hit-point sync is not a feature. Duration is exact to the second, and a swell landing on a specific frame remains a manual job in the DAW.
Registrability is a separate question from ownership. Per the Stability AI Community License between the user and Stability, the user owns outputs and can use them at their discretion. Whether a cue can be registered with the US Copyright Office turns on human authorship, and exact criteria for copyrightability is an ongoing matter of debate. For a temp cue that gets replaced, none of this matters. For a cue that stays, it does.
Common questions about AI music in a film edit
Can I use AI-generated music as a temp track?
Yes, and a generated temp reduces the clearance exposure that a copyrighted temp creates. Cues generated with Stable Audio 3.0 come from models trained on audio licensed from AudioSparx together with Creative Commons recordings from Freesound, per the Stable Audio 3.0 Medium model card, so no sync or master-use obligation attaches to the cue. The same cue can then stay in the cut through a screener or a sale.
Do I need to clear a temp track before submitting to a festival?
This is a question to confirm with the festival you’re submitting to. Sundance’s submissions FAQ permits temp tracks, scratch music, and temp scores, provided missing or temporary elements are listed on screen before the film begins. Sundance exhibition is different: the submitter warrants that screening the film infringes nothing and that clearance fees are paid. Check each festival's own terms.
Will an E&O insurer accept AI-generated music in the cue sheet?
Ask the carrier before relying on it. Errors and omissions underwriters review the music cue sheet and can decline coverage or exclude cues where clearance documentation is missing.
Can an AI temp cue stay in the final mix?
Commercially, yes. Stability's Community License covers commercial use free for organizations under $1M in annual revenue, and an Enterprise License applies above that threshold. Two things still need checking: whether the cue holds up against a scored alternative in the mix, and whether the production needs the cue to be a registrable work.
Can I copyright a score generated with AI?
Copyrightability of AI-generated and AI-assisted creative works is subject to great debate and differs from one jurisdiction to the next. Greater human involvement in the work increases likelihood of copyright being granted, and Stable Audio 3 models provide many opportunities for interactive creation, with inpainting and audio-to-audio in addition to prompting.
Can Stable Audio 3.0 generate music to an exact cue length?
Yes. Duration is set in seconds at generation, up to 120 seconds on the Small models and 380 seconds on Medium and Large. A 94-second request returns 94 seconds of audio that resolves at the end, rather than a longer track cut down to fit.
What happens to a generated cue when the edit changes?
Inpainting regenerates only the affected range. Supplying the cue, a start time, and an end time rebuilds that section while leaving the rest untouched, and passing lists to both parameters handles several non-contiguous fixes in one pass. Continuation extends a cue when a scene grows.
Does Stable Audio 3.0 generate songs with vocals?
No. Stable Audio 3.0 produces instrumental music and sound effects. Score, underscore, and ambience are in scope. A vocal song for a needle-drop moment is not.
Last updated: September 18, 2026
