higgsfield-audio

name	higgsfield-audio
description	Use when the user asks about audio in Higgsfield videos, needs to add dialogue or lip-sync, wants sound effects or ambient sound in generated video, asks about music or BGM in output, or is using any audio-capable model (Kling 3.0, Seedance 1.5 Pro, Seedance 2.0, Veo 3/3.1, Grok Imagine Video). Also use when the user's prompt would benefit from audio direction but they haven't mentioned it. Also use when the user wants standalone audio — a soundtrack, ambience bed, multi-speaker scene audio (Seed Audio 1.0), or text-to-speech voiceover.
user-invocable	true
metadata	{"tags":["higgsfield","audio","dialogue","lip-sync","SFX","ambient","sound","BGM","music","voice","seed-audio","scene-audio","TTS"],"version":"3.7.0","updated":"2026-08-22T00:00:00.000Z","parent":"higgsfield"}

Higgsfield Audio Prompting Guide

QUICK FACTS

Routing aids — read the linked sections for the full rules.

• Native-joint audio models: Kling 3.0, Seedance 2.0 / 1.5 Pro, Veo 3/3.1, Grok — all others add audio in post →
• Four layers to consider per prompt: Dialogue / SFX / Ambient / BGM →
• Lip-sync is the most failure-prone feature: 3–8s clips, MCU framing, one speaking face, locked camera, no head-motion tokens; per-language sync-word budgets are FIELD-reported →
• Seedance 2.0 @Audio1 is a conditioning INPUT — beat sync, the [AUDIO: Xs] script block, and the first-15s extraction trap →
• Scope an audio reference like an image one: name the property that rides, the property that must NOT, and where the excluded one comes from instead →
• Multi-clip assembly: one master track · cuts land on musical punctuation, never inside a sung vowel (ECU mouth-match is the one exception) · unified grain + LUT masks batch color drift →
• Cinema Studio 3.0 native joint audio (SCELA): describe audio as a separate section; specific foley beats generic moods →
• Seed Audio 1.0 (seed_audio, standalone) = whole-scene audio in ONE pass — multi-speaker dialogue + music + SFX + ambience mixed →
• Standalone Audio catalog (2026-08-01 snapshot): seed_audio, qwen_audio_tts (NEW — Qwen 3.0 TTS Flash, expressive instructions + cloned voices), text2speech_v2 (5 engines incl. cozy_voice), plus 3 game-pipeline-only tools — distinct from in-video joint audio →

Which Models Support Audio?

Model	Audio type	Dialogue	SFX	Ambient	BGM	Lip-sync
Kling 3.0 / Omni	Native joint	✅	✅	✅	✅	✅ Multi-language
Seedance 2.0	Native joint	✅	✅	✅	✅	✅ Multi-language
Seedance 1.5 Pro	Native joint	✅	✅	✅	✅	✅ Best lip-sync
Veo 3 / 3.1	Native joint	✅	✅	✅	✅	✅ English best
Grok Imagine Video	Native joint	✅	✅	✅	✅	✅
All other models	❌	—	—	—	—	—

"Native joint" means audio and video are generated simultaneously in one pass — not layered on after. This produces natural synchronization without post-production.

Models without native audio: add audio in post with Lipsync Studio or external tools.

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The Four Audio Layers

Every audio-capable prompt should consider four layers. You don't need all four in every prompt, but knowing which to include gives the model clear direction.

1. Dialogue — What characters say

Put dialogue in quotes. Be explicit about who speaks, their tone, and language.

She says: "We need to leave. Now."
He whispers: "Not yet."

Best practices:

• Keep dialogue short — 1-2 sentences per character per shot
• Specify emotional tone: "says urgently", "whispers", "shouts across the room"
• For non-English: specify language and dialect → She speaks in Cantonese: "走啦"
• For Seedance 1.5 Pro: supports English, Chinese (incl. Sichuanese, Cantonese, Taiwanese Mandarin, Shanghainese), Japanese, Korean, Spanish, Indonesian

2. SFX — Specific sound events tied to action

Describe SFX at the point they happen. Tie them to visible actions.

The glass shatters on the floor — sharp crack, then settling tinkle.
Footsteps on wet concrete — splashing, rhythmic.
A door slams shut — heavy metal, echoing.

Best practices:

• One SFX description per action beat
• Use onomatopoeia sparingly — descriptive phrases work better than "BANG" or "CRASH"
• Tie timing to action: "as she sets the cup down" not "cup sound at 4 seconds"

3. Ambient — Background soundscape

Set the acoustic environment. This is the continuous sound bed.

Ambient: quiet café murmur, espresso machine, rain against windows.
Ambient: forest at night — crickets, distant owl, gentle wind through leaves.
Ambient: busy intersection — traffic, horns, construction in the distance.

Best practices:

• 2-3 ambient elements maximum — more gets muddy
• Describe the space acoustics: "reverberant church hall", "tight car interior"
• Contrast silence with sound for impact: "Dead silence. Then — a single footstep."

4. BGM — Background music mood

Don't name songs or artists (content filter). Describe the musical texture.

BGM: slow piano, minor key, melancholic.
BGM: tense orchestral build — low strings, rising.
BGM: lo-fi hip-hop beat, warm vinyl crackle, relaxed.

Best practices:

• Describe instrumentation, tempo, mood — not genre labels alone
• "Tense strings, building" works better than "suspenseful music"
• Specify when music enters/exits: "Piano enters at the midpoint, builds to the end"
• For beat-sync content: "Cuts match the downbeat" or "Movement peaks on the drop"

Suppressing music — NO BGM is a spec, no music is a preference

[DEMO — Joey cinema-director-v3, 2026-08-16] [UNPROVEN HERE] When a piece must carry no score, the phrase matters. no music reads as a weak stylistic preference and loses to the model's strong prior that generated video wants a bed under it. NO BGM reads as a production term — a hard spec — and is the form to write. Expand it once on first use so the abbreviation is unambiguous, then let it carry.

Lead positive, then negate. Name what the audio is before naming what it is not — diegetic sources tied to surfaces and materials, plus room tone. A suppression clause with nothing positive in it leaves the model to decide what "silence" sounds like, and it decides in favour of a pad.

Audio: diegetic sound only — footsteps on wet stone, fabric shift, breath, room tone.
NO BGM — no background music of any kind. No score, no soundtrack, no instrumental,
no underscore, no ambient musical pad, no drone, no tone bed. Nothing musical at any point.

Promote it to the top on a scene that must land silent. Audio instructions carry more weight early; by the time the model reaches a closing audio block it has already decided what the piece sounds like. State NO BGM in the header alongside shot count and cut policy, then restate it as the closing audio clause.

Enumerate with care — this cuts against the house rule on negation. ../shared/negative-constraints.md and the repo's staging-reference doctrine both hold that naming a thing under a negation ships the token anyway and can prime the very output you are refusing. The source's long list (score, soundtrack, instrumental, underscore, ambient pad, drone, tone bed, swell, sting, humming, whistling, lyrics) is its answer to a real failure — a bare negation lets the model supply an "ambient texture" and consider the instruction honoured — but it is one practitioner's fix and is not measured here. Default to the short form above; reach for the full enumeration only when a short form has already failed on the shot in front of you, and expect the enumeration itself to carry some priming risk.

Attached-track lock. When an audio or video track is attached it is the sole and complete audio source, and it owns all internal timing — never impose per-beat timing on a lipsync take:

AUDIO: the attached clip @Video 1 is the sole and complete audio source for this
sequence. Generate no additional audio of any kind — no room tone, no foley, no
ambience, no breath, no added dialogue, NO BGM.

The unheard-track technique lets bodies perform to music that is not in the mix — useful when the score is added in post: state that the track is inaudible, then describe the performance against it ("singing roughly in time to the unheard 87 BPM beat"), plus the diegetic layer that IS heard.

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Audio Prompt Structure

Add audio cues naturally within your prompt or as a dedicated block at the end.

Inline method (preferred for short prompts):

A woman walks into a quiet library. Her heels click on the marble floor — each step
echoing. She whispers to the librarian: "Do you have the Collected Letters?"
Distant page turns. A clock ticks somewhere above.

Dedicated block method (better for complex audio):

[Scene description — visual content, action, camera]

Audio:
  Dialogue: She says "We leave at dawn." He replies: "I'll be ready."
  SFX: coffee cup set down, chair scraping back
  Ambient: early morning kitchen — birds outside, kettle just boiled
  BGM: none — silence emphasizes the tension

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Lip-Sync Rules

Lip-sync is the most failure-prone audio feature. Follow these rules strictly:

Expressive facial acting around the words — forced smiles, leaking fear, mixed emotions during a spoken line — is driven separately by FACS Action Unit codes per beat. Let lip-sync shape the phonemes; schedule the brow/eye/cheek AUs for the performance. See ../higgsfield-facs/SKILL.md § Dialogue & Monologue Facial Acting.

Do:

• Keep dialogue clips 3–8 seconds (sweet spot for accuracy)
• Use medium close-up or closer framing — model needs to see the mouth clearly
• One speaking face per shot — multiple faces break audio routing
• Lock the camera: locked-off static camera or slow Dolly In only
• Remove all head/face motion tokens: nodding, turning head, looking around compete with the lip engine and cause desync

Don't:

• Don't combine dialogue with vigorous head movement in the same prompt
• Don't use 15s clips for lip-sync — technical max but accuracy degrades past 8s
• Don't include ambient or music tokens if lip-sync is the priority — they invite the generative audio engine to override your dialogue
• Don't use non-MP3 audio for Seedance 2.0 (when available) — WAV/AAC/OGG fail silently

Multi-character dialogue workaround:

Multi-person lip-sync matching is an unresolved limitation across all models. The production workaround:

1. Generate each character separately with their own audio segment
2. Composite in CapCut/Premiere using picture-in-picture + linear mask (15% feather)
3. Static image for the listening character; generated video for the speaking character

Per-language dialogue-sync budgets [FIELD — community, seedance-2.0 repo v6.6.0]

Field-observed word budgets for reliable lip-sync in a ~15s in-video Seedance dialogue clip — not official limits, and not the same as how many words the model can voice. The acoustic budget ≠ reliable-sync budget: the model will happily speak more words than it can keep synced to the mouth.

Language	Reliable-sync budget (~15s clip)	Notes
English	~16–20 words (5–10 per line)	Strongest Western language
Mandarin	—	Strongest sync overall
Russian	~10–15 words	Weak — budget conservatively
Japanese / Korean	Under-tested	No reliable field numbers yet

Cross-language sizing unit: "one short sentence ≈ one breath." Write dialogue in breath-sized sentences and count breaths, not seconds.

Voice-reference lip-sync path [FIELD — community, seedance-2.0 repo v6.6.0]

On surfaces that accept a spoken-voice reference, an attached rights-cleared voice recording drives lip-sync directly — the model syncs the mouth to your recording instead of synthesizing a voice first. This is the most reliable field-reported path for non-English dialogue (it sidesteps the weak-language sync budgets above). Rights-sensitive: only use recordings you have clear rights to — cloned or scraped voices are out.

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Audio as a Conditioning Input — Seedance 2.0 (@Audio1)

The most under-used Seedance 2.0 capability: an uploaded audio file is a conditioning input, not just an output track. The model spec lists audio as a reference media role alongside image / video, and generate_audio (native sound output) is documented as independent of the audio reference medias — i.e. the uploaded file conditions the generation, and whether the clip also gets generated sound is a separate switch.

This means @Audio1 has two distinct jobs, and you pick one per shot:

Use	What @Audio1 does	Prompt discipline
Audio-as-output	Plays the uploaded track unmodified as the clip's soundtrack	Timestamp-anchor it (plays exactly as uploaded from 0s to end) and remove all ambient/SFX/music tokens so the engine doesn't override it (see § Seedance 2.0 below)
Audio-as-driver (beat sync)	Drives the visuals — cut timing, camera acceleration, action pace, energy peaks	Write the audio→visual mapping explicitly (below). The clip can still get generated sound, or set generate_audio false for visuals-only.
Audio-as-performance	The character on screen performs the track — hums, sings, plays along, moves to it — hitting the actual notes	Scope it to the one property you want (§ Scope an audio reference, below). Unscoped, it also lends its voice.

Why it works (author's model — empirical, not in the official spec): the temporal branch that reasons about motion and pacing reads the sound's structure — beat positions, dynamic contour, timbral texture, song-structure sections — and maps it to visual rhythm. Treat the mechanism as a working model; treat the capability (audio reference role) as confirmed.

Scope an audio reference — say which property rides

Every image reference in this stack is scoped in both directions: what it locks, and what must be read past ("ignore the sheet's grey background", "not its camera vantage"). Audio references have had no equivalent vocabulary, and they need one for the same reason — a sound file carries several properties at once, and an unscoped reference lends all of them.

The case that shows it [DEMO — Higgsfield "AI Love Stories" tutorial, 2026-08]: a character had to hum a specific tune on camera. Without a reference the model invented a different melody every take — the reported result of the no-reference control was a performance that was off-key with no rhythm. With a voice memo of the tune attached, it hit the notes on the first take.

But the memo was somebody else's voice, and the character has his own. So the reference was scoped in prose:

@Audio1 is the reference for the HUMMED LINE only. Take from it ONLY the
melody: the exact notes, pitches and intervals, the tempo, the phrasing and
the rhythmic pause — note for note, beat for beat, nothing improvised. Do NOT
copy the voice, timbre or vocal identity heard in the recording — he hums in
his OWN natural speaking voice, the same voice he speaks his lines with. All
spoken dialogue is performed as scripted below, not taken from any audio.

The pattern, generalised — three parts, and the third is the one that gets skipped:

1. Name the property that rides, as narrowly as you can: notes, pitches and intervals; tempo and phrasing; the rhythmic pause. Not "the song".
2. Name what must NOT ride, explicitly: voice, timbre, vocal identity. Sound files carry a performer as well as a performance.
3. Say where the excluded property comes from instead — "his own natural speaking voice, the same one he speaks his lines with". A reference that is only told what not to do leaves the model to pick, and it will pick the reference.

The same three-part shape works for other audio properties:

Riding	Excluded	Sourced instead from
melody, tempo, phrasing	voice, timbre, identity	the character's own speaking voice
rhythm and accent pattern	instrumentation, key	the scene's own diegetic sound
emotional contour, dynamics	the words	the scripted dialogue

Scope note. Whether a reference track becomes the spoken output differs by model line — see § Audio by Model. The scoping vocabulary above is about which property transfers, and is written to be read alongside whatever that line does with an attached track, not instead of it.

Rights: the memo above was recorded by the person for this purpose. Same constraint as the voice-reference lip-sync path — use recordings you have clear rights to.

[UNPROVEN HERE] — one production, one property (melody). The mechanism is already confirmed (audio is a reference media role); what is unproven here is how far prose scoping steers it. Cheap to test on any tune you own.

Beat sync — the audio choreographs the visuals

Upload an MP3 as @Audio1, then map audio characteristics to visual elements. The minimum is three sentences, each handling one thing — rhythm source / which visual responds / how energy maps to the arc:

Use @Audio1 as the rhythmic foundation. Sync camera transitions to the beat
positions. Visual energy builds with the audio crescendo and peaks at the drop.

You can assign different visual elements to different audio characteristics — mixing audio-to-visual the way you'd mix a track:

@Audio1 drives the visual rhythm. Camera cuts land on the downbeats. Subject
movement accelerates into the build, holds at the peak, releases on the drop.
Colour temperature shifts warmer with the crescendo.

Camera ← beat position. Movement ← dynamic contour. Colour ← overall energy arc.

It stacks with other references — character from @Image1, camera style from @Video1, rhythm from @Audio1, processed together:

@Image1 as character reference. Follow @Video1 camera-movement style. @Audio1 as
rhythmic foundation — sync all camera transitions to the beat positions.
Character movement should pulse with the music.

The one constraint: @Video1 camera style and @Audio1 rhythm have to be temporally compatible. A slow continuous dolly pulled from a video reference fighting an EDM track sends the temporal branch conflicting instructions — same failure class as mixing reference images of clashing styles. Pick references that can coexist. (Sibling of ../higgsfield-seedance/SKILL.md § Reference Roles → Load-Bearing Rule: references stay in their lanes.)

Cutting to music — assembling separately-generated clips on one track

[EMPIRICAL — MiniMax H3 skill corpus, re-derived; cross-model editing craft] Beat sync governs what happens inside a clip; these three laws govern the timeline the clips land on:

• One master track. The piece binds to a single continuous music track laid in post — never per-clip audio stitched end to end. A join in the music is audible before a join in the picture is visible.
• Cuts land on musical punctuation — a breath, a lyric pause, a snare, the drop. Never hard-cut inside a sung vowel unless the incoming shot is an ECU whose mouth shape continues that vowel: lip continuity is an edit constraint, not only a prompt constraint.
• Mask batch color drift on purpose. Clips generated in separate runs never match grade exactly. One unified fine-grain pass plus one LUT across the whole timeline, applied as a deliberate finishing step, hides the inter-clip color variance that would otherwise read as a continuity error.

The [AUDIO: Xs] script block — dialogue + SFX + lip-sync from text alone

No microphone, no recording. A timestamped script inside the prompt text generates voices, SFX, and lip-sync. Quoted text → speech with automatic lip-sync; physical descriptions → sound effects. Each marker is a timestamp in the clip:

[AUDIO: 0s] heavy footsteps on concrete, echoing in a corridor
[AUDIO: 2s] door bursting open, impact bang
[AUDIO: 3s] character says "Nobody move"
[AUDIO: 5s] tense silence, distant traffic
[AUDIO: 7s] character says "Put it down. Slowly."
[AUDIO: 9s] object placed on table, soft thud

The model generates the voice first, then maps facial movement to the waveform — so lip-sync quality is mostly set by how precisely you wrote the dialogue. Exact quoted text outperforms paraphrase. It works across languages (write the line in Spanish/Japanese/French → speech with phoneme-level lip-sync in that language).

This obeys the same physical rules as § Lip-Sync Rules above: a strong @Image1 character reference gives a consistent mouth structure to animate, and close-up framing beats wide (a small face has too few pixels to sync). Keep individual dialogue beats inside the 3–8s accuracy window.

It combines with beat sync in one generation — uploaded music as the rhythmic foundation, the script block as foreground dialogue/SFX, cuts synced to the beat:

@Audio1 as background music. Sync camera transitions to the beats.
[AUDIO: 0s] music from @Audio1 begins
[AUDIO: 3s] character says "This changes everything"
[AUDIO: 5s] sharp breath — beat drop hits simultaneously
[AUDIO: 8s] character says "Let's go"

The 15-second extraction problem — pick the window, don't upload the track

The audio reference limit is 15s, and the model takes the first 15s of whatever you upload. Drop in a full 3-minute track and you almost always feed it the intro — low energy, often ambient, no rhythmic drive. Nothing for the temporal branch to map.

The right 15s follow a build → drop arc: rising tension into a peak. That dynamic gradient is what becomes visual energy structure. A segment with uniform energy gives the model beats to detect but no arc — output is rhythmically synced but dramatically flat.

Where the window lives:

• Pre-chorus into chorus
• Instrumental build into the drop (EDM, electronic, hip-hop)
• Verse climax into a bridge
• The last 15s of an intro that breaks into the first hook

Extract exactly that segment before uploading. MP3 at ≥256kbps — lower bitrate degrades beat detection. Don't upload the full track and hope; pick the window, cut it, upload that. (Flipping the workflow — audio in first, visuals built around it — changes the output at a structural level, not subtly.)

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Audio by Model — What Works Best Where

Kling 3.0 (V3) / 3.0 Omni (O3)

• Best overall audio-visual integration
• Multi-language dialogue (English, Chinese, Japanese, Korean, Spanish + regional accents: American English, British English, Indian English)
• Multi-character dialogue: 3+ characters with correct speaker attribution and lip-sync per character
• Voice Binding: lock specific voice profiles to specific characters across shots
• O3 adds Voice Extraction from static images: upload audio clip (min 3s) + image to build a voice profile
• O3 adds Performance Cloning: act out a scene on camera → AI re-renders preserving likeness and voice
• Include dialogue, ambient, and SFX naturally in the prompt
• Prompt like a script: action + camera + mood + dialogue cues together

Audio Speaker Attribution Format (V3/O3):

[Speaker: Character Name] "dialogue" in a [warm/confident/excited] [male/female] voice with [accent].
Add [sound: footsteps / rain / door closing] when [action].
Background ambient: [environment description].

Seedance 1.5 Pro

• Best lip-sync accuracy of all models
• Class-leading multilingual support including Chinese dialects
• Most stable emotional tone control
• Use for: professional dialogue scenes, multilingual content

Seedance 2.0

• Upload MP3 audio as @Audio reference (part of Rule of 12)
• MP3 only — WAV/AAC/OGG/FLAC fail silently with no error
• Max 15s per clip, 3 audio files, 10MB each; ≥256kbps for beat-sync (beat detection)
• Measured enforcement bounds [EMPIRICAL — third-party, China Ark lane, 2026-08]: per-clip duration is enforced at 1.8–15.2s, and the total across all attached clips is also capped at ≤15.2s — three individually-legal 6s clips get rejected (captured 400 errors). Measured on the China Ark lane by a third party; Higgsfield's own proxy enforcement is unverified — if a multi-clip attach fails, this total cap is the first suspect.
• Timestamp anchoring (audio-as-output): "Audio @Audio1 plays exactly as uploaded from 0s to end. Do not modify." Then remove all ambient/SFX/music tokens to prevent the generative engine from overriding.
• @Audio1 is also a visual driver — beat sync, the [AUDIO: Xs] script block, and the first-15s extraction trap are all in § Audio as a Conditioning Input above.

Diegetic-only convention for the prompt body — a prompt-authoring discipline that sits on top of Seedance 2.0's audio capability. BGM is a valid audio layer (see § The Four Audio Layers above) — that's what Seedance can generate. The diegetic-only convention is what you should write in the prompt body: only sounds that physically exist in the scene (footsteps on wet pavement, fabric whip on motion, breath, room tone, weather, weapon fire, crowd reaction, stage haze) rather than naming songs, lyrics, or score cues. If music is intended for the final cut, layer it in post rather than in the prompt body.

Two reasons the discipline matters even though BGM is supported: (i) score descriptors ("dramatic strings", "orchestral swell") underdetermine the generated audio and routinely produce generic music beds at odds with the scene; (ii) the timestamp-anchoring + remove-all-music-tokens pattern in the bullets above already enforces this discipline when an MP3 audio reference is uploaded — the diegetic-only convention generalizes that pattern to all Seedance prompts whether or not an audio reference is attached.

Veo 3 / 3.1

• Strong native audio for English dialogue and environmental sounds
• Dialogue in quotes: "This must be it," he murmured.
• SFX explicitly: tires screeching loudly
• Ambient as environment soundscape descriptions

Grok Imagine Video

• Improved audio as of Video Imagine 1.0 (Feb 2026)
• Include audio intent directly in prompt — same inline style as other models
• Best for: social clips where audio adds polish but isn't the hero

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Common Audio Failures and Fixes

Problem	Cause	Fix
Lip-sync completely off	Audio > 8s, or head motion tokens present	Trim to 5s, remove nodding/turning tokens
Model replaces uploaded audio	Ambient/music tokens in prompt invite generative override	Add timestamp anchoring phrase, remove all ambient/music tokens
Dialogue missing entirely	Non-MP3 format used (Seedance 2.0)	Convert to MP3 128-320kbps
SFX drowns out dialogue	Too many SFX cues competing	Reduce to 1-2 SFX per shot, prioritize dialogue
Audio sounds robotic	Flat emotional cues	Add emotional direction: "says warmly", "whispers with urgency"
Background music too loud	BGM description too prominent in prompt	Move BGM to end of prompt, reduce detail, or say "subtle BGM"

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When to Skip Audio

Not every prompt needs audio direction. Skip audio cues when:

• Using a model without native audio (Kling 2.6, Wan 2.6, Seedance Pro, Minimax Hailuo 2.3/02)
• The content is purely visual (product beauty shots, abstract motion, landscape)
• Audio will be added entirely in post-production
• The prompt is already at the short-form 200-word cap and visual direction is more important

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Negative constraints: For audio-specific artifacts (lip-sync desync, background music overriding dialogue, SFX drowning dialogue) and their prevention phrases, see ../shared/negative-constraints.md — Temporal/Consistency Artifacts section.

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Cinema Studio 3.0 Audio (Business/Team Plan)

Cinema Studio 3.0 introduces native audio-video joint generation — a fundamental shift from models that treat audio as a post-processing step.

Native Audio-Video Joint Generation

Audio is generated simultaneously with video via a unified multimodal architecture. This means:

• Audio and video are temporally aligned by default — no manual sync needed
• Dual-channel stereo output
• Sound design prompts directly influence both audio AND visual generation
• Audio is not "added on" — it's part of the same generation pass

Audio as Prompt Element (SCELA)

Always describe audio as a separate section in your prompts. The generation engine handles three parallel audio tracks:

1. BGM — background music, score
2. Ambient SFX — environmental sounds, foley
3. Dialogue — character speech, voiceover

A chef slices vegetables rapidly on a wooden cutting board.
Camera: tight close-up tracking the knife.
Style: warm kitchen lighting, shallow depth of field.

Audio: rhythmic chopping on wood, oil sizzling in a nearby pan,
soft clinking of ceramic bowls. Light acoustic guitar BGM.

Input Constraints

Parameter	Limit
Accepted formats	MP3, WAV
Max audio clips	3 per generation
Combined duration	≤15s total
Single file size	<15MB
MP3 bitrate	128–320 kbps

Lip-Sync

Available but experimental in Cinema Studio 3.0:

• Focus on emotion and general mouth movement, not perfect phoneme sync
• Single face per generation only — multi-face lip-sync is not supported
• For best results, keep dialogue segments under 8 seconds
• Pair with clear frontal or 3/4 face angle reference images

Tone / Voice Cloning via @Reference

Control speaking style, accent, and language by referencing a video with the desired voice:

Voiceover tone references @Video1. The narrator describes the product
in a warm, conversational tone. "This changes everything."
Audio @Audio1 plays exactly as uploaded from 0s to end.
Do not modify or replace the audio content.

Dialect Support

Dialects written directly in the prompt work — the model understands regional speech patterns. Write dialogue in the target dialect for authentic delivery.

Timestamp Anchoring

When uploading reference audio that must play unmodified:

Audio @Audio1 plays exactly as uploaded from 0s to end.
Do not modify or replace the audio content.

Then remove all ambient/SFX/music tokens from the prompt to prevent the generation engine from overriding the uploaded audio with generated sound.

Sound Design Specificity

Describe specific foley, not generic moods:

Wrong: nice ambient sounds, pleasant background noise

Right: the scratch of frosted glass, rustling of plush fabric, gentle tapping on acrylic, popping of bubble wrap, wooden floor creaking under bare feet

Specific sound descriptions directly influence the generated audio output. The more precise the foley description, the more accurate the result.

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Scene-Audio Generation — Seed Audio 1.0

Separate from in-video joint audio above: Seed Audio 1.0 (ByteDance, released 2026-06-23 at the FORCE conference) is a standalone one-pass whole-scene audio generator. One generation produces multi-speaker dialogue + music + SFX + ambience, already mixed — a radio-drama scene, not a single voice track. Use it to build a soundtrack for footage you'll assemble in post, or scene audio that has no video at all.

When to choose it — decision table

You need	Use	Why
A whole scene's soundtrack: several speakers + music + SFX + ambience, mixed in one pass	Seed Audio 1.0 (seed_audio)	One-pass scene audio; script-style prompt drives the whole mix
One clean voice track (narration, single-speaker VO)	text2speech_v2 (pick an engine)	Single-voice TTS — simpler, engine-selectable
Sound baked into the generated video, synced to on-screen action and lips	Seedance generate_audio (in-video)	Native joint generation — audio and visuals in the same pass (see § Audio as a Conditioning Input)

Verified surface [OFFICIAL — model spec 2026-08-01]

Model id seed_audio (output_type audio). Parameters:

Param	Range / options	Default
format	wav / mp3 / pcm / ogg_opus	wav
sample_rate	8000–48000 Hz	24000
speech_rate	−50..100	0
loudness_rate	−50..100	0
pitch_rate	−12..+12	0
voice_type + voice_id	preset | element — must travel together	none

Media roles: image_references + audio_references. Per the fal schema: up to 3 reference audio clips (each ≤30s, ≤10MB) XOR one image reference — image and audio refs cannot combine. Reference audio inputs in the prompt by load order: @Audio1, @Audio2, @Audio3.

Script-format prompting [EMPIRICAL — community guides, NOT official docs]

Everything in this subsection is community-converged practice, not spec — treat as a starting point, not a guarantee. Write the prompt as a radio-drama script:

• Open with a scene header: [Scene: busy coffee shop, morning]
• Speaker labels with emotion parentheticals: Host (warm, upbeat): "…"
• Inline sound cues where they happen: [sound: espresso machine, soft jazz fades in]
• Music by mood, not genre: "soft piano builds to triumphant orchestra", not "cinematic score"
• ~4 distinct speakers is the reliable ceiling
• Test 20s segments before scaling toward the ~2-minute cap
• Output WAV (format: wav) when the audio is headed for post

Compact worked example:

[Scene: rain-soaked night market, closing time]
Vendor (tired, warm): "Last skewers — half price, take them."
Girl (excited): "Two! No — three!"
[sound: rain drumming on tarp canopy, a scooter passing in the distance]
Vendor (chuckling): "Three it is. Careful, they're hot."
[sound: coins dropped on a metal tray, charcoal hiss]
Music: a lonely muted trumpet fades in under the rain, wistful but hopeful.

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Standalone Audio tab — tool catalog (2026-08-01 snapshot)

The live standalone-audio catalog, reconciled against the models_explore snapshot of 2026-08-01 (../../specs/models_explore_snapshot_audio_2026-08-01.json; generated table: ../../specs/AUDIO-MODEL-SPECS.md, machine twin ../../specs/audio-model-specs.json — regenerate with python3 scripts/sync_specs.py --type audio). The Audio tab's UI tools — Voiceover (text → speech), Change Voice (swap a voice in any video), Translation (translate speech in any video) — sit on top of these models:

Model id	Name	What it does	Availability
seed_audio	Seed Audio 1.0 (ByteDance)	One-pass whole-scene audio: dialogue + music + SFX + ambience (§ above)	General
qwen_audio_tts	Qwen Audio 3.0 TTS Flash (Alibaba)	Expressive TTS: natural-language instruction for emotion/dialect/speed, preset or cloned reference-element voices, 13 language hints	General (NEW 2026-08-01)
text2speech_v2	Text to Speech V2	Single-voice TTS; engine via variant: elevenlabs, minimax, seed_speech, vibe_voice, cozy_voice (NEW); preset or reference-element voices (voice_type + voice_id)	General
sonilo_music	Sonilo Music (FAL)	Text-to-music with controllable duration	Game pipeline only
mirelo_text_to_audio	Mirelo Text to Audio (FAL)	Text-to-audio SFX with controllable duration	Game pipeline only
inworld_text_to_speech	Inworld TTS (FAL)	Preset-voice TTS, ~110 voices across en/zh/ja/ko/es/fr/de/ru/…	Game pipeline only

Engine picks within text2speech_v2: seed_speech when the deliverable is multilingual voiceover/narration; elevenlabs (Eleven v3) when fine emotional/tone control matters; vibe_voice for long-form narration. These are standalone audio generators — distinct from the native joint audio baked into Kling 3.0 / Seedance 2.0 / Veo during video generation. (Catalog reflects the 2026-08-01 snapshot; verify live before quoting pricing or availability.)

Post-generation voice-over — Supercomputer workflow [DEMO]

A post-generation alternative to prompting audio at all: upload the finished clip to Supercomputer and ask for an analyzed voice-over (e.g. "Analyze the video and create a voiceover for it in the style of wildlife documentaries") — the agent analyzes the footage, writes a script, and offers voices to pick from. Shown working in Higgsfield's Seedance-4K tutorial; useful when the visuals are already locked and only narration is missing.

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Related skills

• higgsfield-seedance-vfx — Footage transforms whose payoff is a camera move synced to a spoken line (crash-zoom / push-in), or preserving the source talk track through a transform (SFX and source dialogue only); see ../higgsfield-seedance-vfx/references/dialogue-timing.md
• higgsfield-models — Which models support native audio
• higgsfield-troubleshoot — Audio failure diagnosis
• higgsfield-cinema — Cinema Studio audio workflow with Kling 3.0
• higgsfield-vibe-motion — Motion graphics with audio (different from AI-generated audio)