skills/ai-film-pipeline-master/references/phase-04-audio-narration/foley-and-sound-design.md

# Foley & Historical Cinematic Sound Design

26 cards. Tactile historical foley, acoustic material signatures of ancient civilisations, cinematic impact hits, and environmental sound effects.

---

### The Bed Before the Spot

**Also called:** the foley selector, bed before spot, is the place already carrying it  
**What it is:** The card at the head of the `foley.` shelf. It does not describe a sound. It asks the three questions this shelf's own `Avoid when:` lines and pair graph keep asking — **what gives this sound away if it is wrong, is a larger soundscape card already carrying it, and does it follow a body, run on its own or land once** — and hands back a named shortlist for each answer. **The second question matters most and the pair field cannot ask it.** Most of this shelf's pairs point at a soundscape bed whose own text already names the foley card's sound, and a bed is not an alternative to a spot effect — it is the thing a spot effect sits inside. The field reads *instead of* where the reader meant *inside*, and this card says which is which. Every card cited here is cited by id.  
**Effect on the audience:** None. This card never reaches the track. It exists so that a spot effect is added because the camera is on the one thing making it, not because the card existed and the bed already underneath it was forgotten.  
**Used for and where it works best:** Answer the three questions **in order and out loud, one sentence each, before you open the shelf**. Question one splits the world's sounds from the film's own hits, and those are two decisions: the hits are chosen alongside the stings and risers of the shot-planning shelf and the score, and no world card on this shelf ever cites one. Question two is where most readers should stop: **if a larger soundscape card already names the sound and the camera is on the place, you do not need a card from this shelf — you need the bed**, and the foley card is lifted out of the bed only when the camera goes close on the one source. Question three tells you how the card you keep sits against the bed: a sound that follows a body rides on top of it while the body is in shot, a sound that runs lives inside it, a sound that lands breaks through it and is gone.  
**Best in:** formats: all | genres: all  
**Avoid when:** **Your shot has both a place and an object in it.** The map hands you one card where the honest answer is a bed plus a spot effect, and nothing in the package tells you when to lift the spot effect out: the edges run from this shelf up to the beds and never once from a bed back down to an object. **Distrust question one's first value on any period subject.** Every anachronism line on this shelf guards against the modern world — nylon, rubber tyres, motorboats, church bells, plate armour — and not one guards against the wrong ancient century. What this map calls *right* is only *not modern*; the period is the canon's to settle, not the card's. `soundscape.foley_clay_tablets` carries a period gate that its twin `foley.cuneiform_tablet_foley` does not, and a reader who meets the twin first meets no gate at all. And avoid it for the film's own hits taken alone: the same moment is decided by `sound.` and `score.` cards, and a hit chosen here without looking there is chosen from half the candidates.  
**Example:** `[Selector — produces no cue. It returns card ids. The chosen card carries the cue.]`  

---

**The axes**

**Axis 1 — What gives it away if it is wrong?**
Asked first because every `Avoid when:` line on this shelf answers it, and answers it one of exactly three ways. A made thing fails as an anachronism — *"Rubber tire rolls or modern engine sounds"* (`foley.war_chariot_creak`), *"Light, silky modern nylon swishes"* (`foley.ceremonial_wool_rustle`), *"Fast motorboat wakes or churning metal propellers"* (`foley.marsh_reed_boat`). A sound of the land or of a trade fails in the wrong setting — *"Lush coastal or forest scenes"* (`foley.desert_dust_devil`), *"Arid mountain fortresses"* (`foley.marsh_night_chorus`), *"Desert battlefields or desolate ruins"* (`foley.coppersmith_hammer`). The film's own hit fails on a moment too small for it — *"Quiet naturalist historical documentaries"* (`foley.cinematic_braam_hit`), *"Minor comedic or transactional transitions"* (`foley.sub_drop_50hz`), *"Casual scene cuts where the silence reads as an encoding error"* (`foley.acoustic_vacuum_drop`). The `Yields to:` field agrees: the setting cards pair with each other on setting — *"Wetland night instead of arid night"*, *"Arid locations, where a frog chorus is wrong"* — and the hits leave on register — *"Naturalist history, where a trailer braam reads cheap"*, *"Period documentary, where a glitch edit breaks authenticity."* The third value is a second decision sharing this file: its six cards never cite a world card, and no world card cites them.

**Axis 2 — Is a larger soundscape card already carrying it?**
The most repeated condition on the shelf, seven times over: *"Massed combat rather than a single blade"*, *"Massed chariot warfare rather than one cart"*, *"The waterway bed rather than one hull"*, *"The whole sanctuary rather than one strike"*, *"Whole-city background, not the artisan quarter"*, *"Full battle bed, which already carries the horns"*, *"The sanctuary bed already carries the brazier."* Read as the pair field reads them, they offer an alternative. Read against the cards they point at, they do not: in every one of the seven, the bed's own `What it is:` already names the source — *"bronze and iron blades"*, *"chariot wheels"*, *"war horns"*, *"mashoof boats"*, *"bronze ceremonial bells"*, *"frankincense coals in bronze braziers"*, *"coppersmith hammers clinking on anvils"*. An eighth goes further: `soundscape.foley_ancient_garments` has as its own `Example:` the wool-and-braided-fringe friction that is `foley.ceremonial_wool_rustle`'s whole content. Three more cards on this shelf say outright that they are the same sound written twice — *"The canon-gated version of the same foley"*, *"The same drop written on the SFX shelf"*, *"The same scroll-and-seal foley, era-gated."* So the question this shelf actually asks is not *which card instead* but **is the camera on the place, or on the one thing in it**.

**Axis 3 — Does it follow a body, run on its own, or land once?**
Asked last, and the fewest conditions carry it, but it is the one that tells you how the card you keep sits against the bed: *"Continuous desert wind rather than a whirlwind event"* (`foley.desert_dust_devil`), *"When the build must actually peak and stop"* (`foley.shepard_tone_riser`), *"Only the score drops; the world keeps running"* (`foley.acoustic_vacuum_drop`), *"Gentle dialogue scenes or continuous unbroken shots"* (`foley.reverse_cymbal_swell`'s own boundary), and from the shot-planning shelf, *"The vacuum precedes an impact, not a cut"* (`sound.silence_before`).

---

**The map**

**Axis 1 — what gives it away**

| Answer | The shortlist, by id |
| :--- | :--- |
| **A made thing — it fails as an anachronism** (fourteen) | `foley.bronze_vs_steel_blade` · `foley.mud_brick_footsteps` · `foley.ceremonial_wool_rustle` · `foley.war_chariot_creak` · `foley.cuneiform_tablet_foley` · `foley.marsh_reed_boat` · `foley.bronze_temple_gong` · `foley.flaming_arrow_hiss` · `foley.palace_cedar_door` · `foley.papyrus_and_seal_crack` · `foley.ancient_war_horn` · `foley.scale_armor_march` · `foley.desert_mud_roof_rain` · `foley.frankincense_brazier` |
| **The land, the weather or a trade in its place — it fails in the wrong setting** (five) | `foley.desert_dust_devil` · `foley.coppersmith_hammer` · `foley.boiling_pitch_cauldron` · `foley.desert_night_insects` · `foley.marsh_night_chorus` |
| **The film's own hit — it fails on a moment too small for it** (six) | `foley.cinematic_braam_hit` · `foley.sub_drop_50hz` · `foley.shepard_tone_riser` · `foley.reverse_cymbal_swell` · `foley.stutter_audio_impact` · `foley.acoustic_vacuum_drop` |

**Axis 2 — is something larger already carrying it**

| Answer | The shortlist, by id |
| :--- | :--- |
| **Yes — a larger soundscape card already names it. On the place, take that card; on the one source, lift this one out of it** (eight) | `foley.bronze_vs_steel_blade` · `foley.war_chariot_creak` · `foley.ancient_war_horn` · `foley.marsh_reed_boat` · `foley.bronze_temple_gong` · `foley.frankincense_brazier` · `foley.coppersmith_hammer` · `foley.ceremonial_wool_rustle` |
| **It is written twice — a twin on another shelf carries the same sound, and two of the three twins carry a period gate this card lacks** (three) | `foley.cuneiform_tablet_foley` · `foley.papyrus_and_seal_crack` · `foley.sub_drop_50hz` |
| **No — no place bed names it, and this card is the only source** (fourteen) | `foley.mud_brick_footsteps` · `foley.flaming_arrow_hiss` · `foley.palace_cedar_door` · `foley.boiling_pitch_cauldron` · `foley.desert_mud_roof_rain` · `foley.scale_armor_march` · `foley.desert_dust_devil` · `foley.desert_night_insects` · `foley.marsh_night_chorus` · `foley.cinematic_braam_hit` · `foley.shepard_tone_riser` · `foley.reverse_cymbal_swell` · `foley.stutter_audio_impact` · `foley.acoustic_vacuum_drop` |

**Axis 3 — how it sits against the bed**

| Answer | The shortlist, by id |
| :--- | :--- |
| **Follows a body — it starts and stops with a hand, a foot, a wheel or a hull, and rides on top of the bed while that body is in shot** (nine) | `foley.mud_brick_footsteps` · `foley.ceremonial_wool_rustle` · `foley.war_chariot_creak` · `foley.scale_armor_march` · `foley.marsh_reed_boat` · `foley.cuneiform_tablet_foley` · `foley.papyrus_and_seal_crack` · `foley.palace_cedar_door` · `foley.coppersmith_hammer` |
| **Runs on its own — nobody is doing it, and it lives inside the bed** (six) | `foley.desert_night_insects` · `foley.marsh_night_chorus` · `foley.desert_mud_roof_rain` · `foley.boiling_pitch_cauldron` · `foley.frankincense_brazier` · `foley.shepard_tone_riser` |
| **Lands once — it breaks through the bed and is gone** (ten) | `foley.bronze_vs_steel_blade` · `foley.bronze_temple_gong` · `foley.flaming_arrow_hiss` · `foley.ancient_war_horn` · `foley.desert_dust_devil` · `foley.cinematic_braam_hit` · `foley.sub_drop_50hz` · `foley.reverse_cymbal_swell` · `foley.stutter_audio_impact` · `foley.acoustic_vacuum_drop` |

*A card appears once per axis. The answer is the intersection of the three shortlists, and it is normally one to three cards wide. **When Axis 2 answers yes and the camera is on the place, the answer is not on this shelf at all.***

---

**The default, and the one against it**

**The default is not on this shelf: it is the soundscape bed for the place, with `foley.mud_brick_footsteps` lifted out of it — and the first half is measured.** Asked where to fall back, this shelf answers off itself. Fourteen of its twenty `Yields to:` edges leave for `soundscape.`; two stay home, and those two are the night choruses pointing at each other. Eight of the fourteen land on a card that already carries the source's sound. **The shelf, asked twenty different ways where to go when the card is not enough, says *wider* — and wider is the bed.**

The measure had to be counted the hard way, because in-degree names a different card. `foley.acoustic_vacuum_drop` is the most-reached card here — three edges, from three families, on two distinct conditions: *"Everything drops, not the score alone"* and *"The drop to dead silence is the effect"* are one condition, *"The vacuum precedes an impact, not a cut"* is the other. It is still not the default. Every one of those edges comes from another shelf, from a reader who had already decided on silence and was being told to take more away; no foley card ever falls back to it. It is where the silence family enters this shelf, not where this shelf retreats to.

The second half is argued, not counted: `foley.mud_brick_footsteps` is filed as the only card that does its job, no place bed names it, and its own scene list — *"Street scenes, marketplace strolls, and temple approaches"* — walks through three of the places the beds describe. It is the spot effect the beds need most often and carry least.

**The one against it is `foley.boiling_pitch_cauldron`.** Every other war sound on this shelf is the battle happening — the blade striking, the arrow landing, the horn blowing, the chariot rolling, the armour marching — and three of those five are already inside the battle bed. This one is the battle not yet begun: a pot simmering on a wall with nobody touching it, before the picture has shown what it is for. Nothing routes to it, it routes nowhere, no bed carries it, and it is the only war card on the shelf that runs instead of landing. The default puts the audience in the place; this puts them one scene ahead of it. Its cost is written in its own `Avoid when:` — the simmer is a kitchen unless the picture says siege — so it needs one shot that says what the pot is for, and the scene it names is a period claim for the canon to settle, not this card. Its near cousin against the grain is `foley.palace_cedar_door`, also outside the pair graph altogether, which is the sound of a room before the room is seen.

---

**The unasked**

**Twenty of the twenty-five cards this map reaches are the target of no `Yields to:` field anywhere in the package.** They can be chosen but nothing ever sends you to them. By id:

`foley.bronze_vs_steel_blade` · `foley.mud_brick_footsteps` · `foley.ceremonial_wool_rustle` · `foley.war_chariot_creak` · `foley.cuneiform_tablet_foley` · `foley.marsh_reed_boat` · `foley.flaming_arrow_hiss` · `foley.cinematic_braam_hit` · `foley.sub_drop_50hz` · `foley.reverse_cymbal_swell` · `foley.stutter_audio_impact` · `foley.desert_dust_devil` · `foley.palace_cedar_door` · `foley.coppersmith_hammer` · `foley.boiling_pitch_cauldron` · `foley.papyrus_and_seal_crack` · `foley.ancient_war_horn` · `foley.scale_armor_march` · `foley.desert_mud_roof_rain` · `foley.frankincense_brazier`

**And the shape of that list is the finding, not its length.** Two things are on it.

**First: every card a larger soundscape card already names is on it, bar one — and the traffic says why.** The beds receive fourteen edges from this shelf and send back one, and that one goes to the vacuum, not to an object. **Not one card anywhere in the package ever sends a reader from a place down to the thing in it.** The graph knows how to widen and has no way to narrow. A reader at the battle bed is never told that a close-up on one blade needs `foley.bronze_vs_steel_blade`; a reader at the bazaar is never told the camera has found the coppersmith. That is containment drawn as a graph — the container receives and does not send — and it is the same finding the soundscape shelf made from its side, confirmed from this one.

**Second: of the fourteen made things, exactly one is reached, and not by anything about scale.** `foley.bronze_temple_gong` is reached from the Christian-era church bell, on *"A pre-Christian temple subject, not a church."* The only edge that ever arrives at an object on this shelf is a period edge. Everything else that is reached is reached sideways or from outside: the two night choruses by each other, the vacuum by three other shelves, `foley.shepard_tone_riser` by its own twin `sound.riser`. **The readers who wrote these fields were each holding one sound and asking what was bigger than it; none was holding a scene and asking what was inside it.**

**So the card this shelf wants is the one that routes down: *the camera has gone close on one source — lift it out of the bed.*** The package already holds the one card that ties a sound to the size of the shot, `sound.perspective`, and no foley or soundscape card cites it. That is where the missing edge would start.

`foley.bed_before_the_spot`

---

### Bronze vs Steel Blade Clatter

**Also called:** ancient blade impact, bronze weapon timbre  
**What it is:** Synthesizing the distinct acoustic timbre of bronze weapons (lower, heavier, duller thud with brief 800Hz ring) vs modern steel (sharp, high-frequency 4kHz scrape).  
**Effect on the audience:** Subconsciously authenticates Bronze Age warfare, distinguishing genuine ancient history from generic Hollywood medieval clanging.  
**Used for and where it works best:** Sword fights, armor impacts, and weapon handling in Sumerian, Akkadian, and Egyptian battles.  
**Best in:** formats: Historical Epic, Animation, Documentary | genres: War, Historical, Heritage  
**Avoid when:** Medieval knight battles or modern warfare.  
**Example:** `foley: Heavy, thick bronze sickle-sword (khopesh) strikes leather shield: dull low thud (180Hz) with short bronze resonance.`  
**Yields to:** `soundscape.ancient_battlefield` — Massed combat rather than a single blade.  
`foley.bronze_vs_steel_blade`

---

### Sun-Dried Mud-Brick Footsteps

**Also called:** adobe footsteps, ancient street foley, dried clay ground  
**What it is:** The acoustic signature of leather sandals or bare feet moving across dried alluvial clay: dry crunches, light dust puff, and hollow clay tap.  
**Effect on the audience:** Transports the listener directly onto the streets of ancient Ur, Babylon, or Eridu.  
**Used for and where it works best:** Street scenes, marketplace strolls, and temple approaches across Mesopotamia.  
**Best in:** formats: Heritage Documentary, Historical Drama | genres: Heritage (civilisation-focused), History  
**Avoid when:** Wet modern asphalt sounds or hollow wooden floorboards in mud-brick environments.  
**Example:** `foley: Leather sole on baked clay dust: dry, crisp crunch with fine grit scatter (decay 150ms).`  
**Source:** assumption — the package's working figure, not a published standard; set the decay by ear against the recorded footstep.  
`foley.mud_brick_footsteps`

---

### Ancient Ceremonial Wool Robes Rustle

**Also called:** woven textile friction, fringed garment foley  
**What it is:** Heavy, dense textile friction of woven unbleached sheep wool, layered with the rhythmic swinging swish of decorative knotted fringes.  
**Effect on the audience:** Communicates elite royal status and ritual dignity without a single spoken word.  
**Used for and where it works best:** Walking movements of Mesopotamian kings, queens, and high priests wearing traditional kaunakes robes.  
**Best in:** formats: Historical Epic, Museum Visuals | genres: Historical, Heritage, Religious  
**Avoid when:** Light, silky modern nylon swishes.  
**Example:** `foley: Thick wool fabric rubbing at 400Hz, accompanied by light dry clicks of braided fringe cords swinging.`  
**Yields to:** `soundscape.foley_ancient_garments` — Linen, leather or non-royal dress.  
`foley.ceremonial_wool_rustle`

---

### Spoke-Wheeled War Chariot Creak

**Also called:** chariot wheel roll, bronze axle strain, ancient vehicle foley  
**What it is:** Strained creak of bent-wood wheel felloes, bronze hub rings rattling against wooden axles, and gravel crunch under heavy two-wheeled carts.  
**Effect on the audience:** Conveys the terrifying mechanical power and rattling brutality of ancient shock warfare.  
**Used for and where it works best:** Assyrian royal lion hunts, chariot cavalry charges at Kadesh, and ceremonial processions.  
**Best in:** formats: Feature Film, Documentary | genres: War, Action, History  
**Avoid when:** Rubber tire rolls or modern engine sounds.  
**Example:** `foley: Rhythmic wooden spoke stress (250Hz groan) + high-frequency bronze hub rattle (3.2kHz) + stones popping under wheels.`  
**Yields to:** `soundscape.ancient_battlefield` — Massed chariot warfare rather than one cart.  
`foley.war_chariot_creak`

---

### Clay Cuneiform Tablet Fracture & Incision

**Also called:** scribe stylus touch, cuneiform tablet handling  
**What it is:** Tactile audio of a reed stylus depressing pliable wet clay, transitioning into the crisp, high-density fracture click of a baked clay contract.  
**Effect on the audience:** Makes ancient literacy feel real, physical, and fragile; emphasizes the miraculous preservation of human words across millennia.  
**Used for and where it works best:** Royal library sequences, archaeological discoveries, and scribal school scenes — which of these may share a frame or a soundscape is a period question, and `soundscape.foley_clay_tablets` carries the canon's answer.  
**Best in:** formats: Heritage / Historical Documentary, Video Essay | genres: Heritage (civilisation-focused), Education  
**Avoid when:** Feather quill scratching or paper tearing sounds.  
**Example:** `foley: Damp triangular reed pressing into clay (slight suction pop), then sharp ceramic fracture as a baked tablet snaps.`  
**Yields to:** `soundscape.foley_clay_tablets` — The canon-gated version of the same foley.  
`foley.cuneiform_tablet_foley`

---

### Marsh Reed Boat (Mashoof) Water Gliding

**Also called:** reed boat gliding, Euphrates marsh water, ahwar canoe  
**What it is:** Water gently lapping against bitumen-coated reed hulls, tall papyrus reeds rustling and bending, and smooth wooden paddle dips.  
**Effect on the audience:** Evokes peaceful, timeless, ancestral southern Mesopotamian water life; provides immediate acoustic tranquility.  
**Used for and where it works best:** Southern marshland scenes, river transport between Ur and Eridu, and agricultural journeys.  
**Best in:** formats: Cultural Documentary, Travel Film | genres: Heritage (civilisation-focused), Nature  
**Avoid when:** Fast motorboat wakes or churning metal propellers.  
**Example:** `foley: Smooth reed hull parting water with gentle hiss (1.2kHz) and rhythmic wooden paddle drip every 1.5 seconds.`  
**Source:** assumption — the package's working figure, not a published standard; set the drip interval by ear against picture.  
**Yields to:** `soundscape.river_civilisation` — The waterway bed rather than one hull.  
`foley.marsh_reed_boat`

---

### Resonant Bronze Temple Gong Strike

**Also called:** sacred temple bell, bronze cymbal toll, ziggurat gong  
**What it is:** A deep, crystalline bronze strike featuring complex microtonal harmonics and an unhurried, natural 4-to-6 second acoustic decay.  
**Effect on the audience:** Instills religious reverence, cosmic dread, and temple sanctity; silences mundane modern mental noise.  
**Used for and where it works best:** Temple dawn ceremonies, royal funerary rites, and divine revelations.  
**Best in:** formats: Epic Film, Historical Animation | genres: Mythology, Faith / Biblical Epic, History  
**Avoid when:** Modern church bells with Western chromatic tuning.  
**Example:** `foley: Heavy wood mallet strikes cast bronze bowl: fundamental at 220Hz with shimmering overtones at 880Hz, 1.4kHz, and 3.1kHz.`  
**Source:** assumption — the package's working figure, not a published standard; set it by ear against the recorded or rendered strike.  
**Yields to:** `soundscape.temple_sacred_chant` — The whole sanctuary rather than one strike.  
`foley.bronze_temple_gong`

---

### Flaming Arrow Swarm Hiss & Thud

**Also called:** fire arrow flight, burning projectile, arrow barrage  
**What it is:** The distinct air-rush hiss of burning pitch wrapped around arrowheads, followed by the heavy fibrous thud of bronze tips burying into cedar walls.  
**Effect on the audience:** Sends visceral panic through the audience; conveys incoming destruction before it hits.  
**Used for and where it works best:** Siege warfare sequences, night ambushes, and river defenses.  
**Best in:** formats: War Epic, Action Film | genres: War, Action, History  
**Avoid when:** Modern bullet ricochet whines in ancient combat.  
**Example:** `sfx: Low air whistling with crackling flame hiss (500Hz-2kHz), terminating in a deep oak wood impact thud — the thud is the loudest thing in the cue; where it sits against the rest of the mix is set in the edit.`  
`foley.flaming_arrow_hiss`

---

### The Hollywood Braam Brass Detonation

**Also called:** Inception horn, cinematic brass slam, trailer braam  
**What it is:** A colossal hybrid impact combining low brass horns (trombones/tubas), analog synth distortion, and sub-bass impact with an aggressive filter sweep.  
**Effect on the audience:** Shakes the listener to the core; signals that an irreversible, epoch-defining catastrophic event is occurring on screen.  
**Used for and where it works best:** Modern trailer climaxes, monumental city gates collapsing, and apocalyptic battle arrivals.  
**Best in:** formats: Trailer / Teaser, Epic Feature Film | genres: Action, Trailer, Epic  
**Avoid when:** Quiet naturalist historical documentaries.  
**Example:** `sfx: Sub-bass 45Hz sine hit + overdriven contrabass trombone blare with 1.8s decay and stereo Haas widening.`  
**Source:** assumption — the package's working figure, not a published standard; set the decay by ear against the rendered mix.  
**Yields to:** `score.revelation_stinger_impact` — Naturalist history, where a trailer braam reads cheap.  
`foley.cinematic_braam_hit`

---

### Sub-Drop 50Hz Revelation Detonation

**Also called:** bass boom, sub-drop impact, seismic revelation  
**What it is:** A pure sub-bass sine drop sweeping rapidly from 80Hz down to 35Hz, decayed over 1.2 seconds with no high-frequency clutter. The endpoints are a design choice, not a standard: check the drop on the speakers the piece will play on, which may reproduce little of it.  
**Effect on the audience:** Delivers a heavy, non-audible physical punch in the chest; underlines a devastating plot reveal or tomb discovery.  
**Used for and where it works best:** The moment the royal seal is broken, a traitor is unmasked, or the burial chamber is unsealed.  
**Best in:** formats: Mystery, Thriller, Feature Documentary | genres: Mystery, History, Thriller  
**Avoid when:** Minor comedic or transactional transitions.  
**Example:** `sfx: 80Hz to 35Hz sine wave pitch drop, length: 1200ms, nothing above it in the spectrum. It needs headroom to land in — how much the mix gives way for it is set in the edit.`  
**Source:** reference — checked 2026-09-23: a sub drop is a sine that falls in pitch inside the sub-bass band, below about 60 to 70 Hz (Wikipedia, *Sub-bass*; Morphic, *Sub drop sound effects*, which adds that small speakers reproduce little down there); no reference fixes its start or end point, so the figures here are a design choice.  
**Yields to:** `soundscape.sfx_sub_bass_hit` — The same drop written on the SFX shelf.  
`foley.sub_drop_50hz`

---

### Shepard Tone Infinite Tension Riser

**Also called:** infinite pitch rise, acoustic escalator, anxiety riser  
**What it is:** An auditory illusion consisting of overlapping sine wave scales separated by octaves that appear to rise infinitely in pitch without getting louder.  
**Effect on the audience:** Generates intolerable subconscious panic, claustrophobia, and mounting dread; the brain feels disaster is seconds away.  
**Used for and where it works best:** Countdown sequences, escaping a burning palace, and ticking clocks before enemy siege rams strike.  
**Best in:** formats: Psychological Thriller, Horror Short, Action Climax | genres: Thriller / Suspense, War  
**Avoid when:** Relaxed educational explainers or celebratory celebrations.  
**Example:** `sfx: 15-second Shepard scale rising continuously beneath high-speed horse gallop sound design.`  
**Yields to:** `sound.riser` — When the build must actually peak and stop.  
`foley.shepard_tone_riser`

---

### Reverse Cymbal Swell into Scene Detonation

**Also called:** reverse crash, incoming suction swell, pre-hit suck  
**What it is:** A reversed orchestral crash cymbal or textured noise wash swelling smoothly over 1.5 seconds, cutting off sharply on frame 0 of a scene cut.  
**Effect on the audience:** Pulls the viewer forward like a vacuum before releasing enormous visual and auditory energy on the cut.  
**Used for and where it works best:** Major scene transitions, transitioning from a calm flashback back into brutal modern reality.  
**Best in:** formats: Trailer / Teaser, High-Pace Short-Form, Drama | genres: Action, Trailer, Drama  
**Avoid when:** Gentle dialogue scenes or continuous unbroken shots.  
**Example:** `sfx: Reversed 18-inch orchestral cymbal crescendo (duration 1800ms) with high-pass sweep ending on sudden frame cut.`  
**Source:** assumption — the package's working figure, not a published standard; set the swell length by ear against the cut.  
**Yields to:** `soundscape.sfx_whoosh_transition` — A textured sweep over a fast cut.  
`foley.reverse_cymbal_swell`

---

### Stutter Audio Impact Edit

**Also called:** stutter cut audio, gate chop, adrenaline glitch  
**What it is:** Chopping an impact sound or screaming line into 1/16th or 1/32nd rhythmic slices synchronized with fast visual strobe cuts.  
**Effect on the audience:** Shatters visual continuity and induces disorientation, simulating the concussive shock of a blast or heavy blow.  
**Used for and where it works best:** Physical explosions, collapsing temple columns, or protagonist psychological shocks.  
**Best in:** formats: Action Short, Modern Trailer, Music Video | genres: Action, Sci-Fi, Psychological  
**Avoid when:** Traditional period documentaries aiming for museum authenticity.  
**Example:** `sfx: 32nd-note audio gate chop applied to battle roar sound effect across 12 frames of high-contrast visual flashes.`  
**Source:** assumption — the package's working figure, not a published standard; set the chop length against the picture cut.  
**Yields to:** `sound.subjective` — Period documentary, where a glitch edit breaks authenticity. And `safety.photosensitive_flash` — the high-contrast flash run the audio chops against; that card owns the rate and where it stops.  
`foley.stutter_audio_impact`

---

### Desert Dust Devil Whirlwind Whistle

**Also called:** arid vortex, steppe wind gust, desert whirlwind  
**What it is:** Swirling high-velocity wind whistle with fine grit particles pelting dry brush, rising and falling in pitch like an ancient ghost.  
**Effect on the audience:** Communicates isolating heat, vast environmental hostility, and ancient mystery.  
**Used for and where it works best:** Desert travel sequences, approaching ruined mounds (Tells), and opening vistas.  
**Best in:** formats: Heritage Documentary, Epic Film | genres: Heritage (civilisation-focused), Nature, Adventure  
**Avoid when:** Lush coastal or forest scenes.  
**Example:** `ambience: Hollow 1.2kHz wind whistle swirling with delicate high-frequency sand grit spray (5kHz-10kHz).`  
**Yields to:** `soundscape.ancient_desert_ambience` — Continuous desert wind rather than a whirlwind event.  
`foley.desert_dust_devil`

---

### Monumental Palace Cedar Door Grate

**Also called:** stone socket hinge, royal gate opening, ancient portal foley  
**What it is:** Low, vibrating wood-and-stone groan of a multi-ton cedar door pivoting slowly inside a hollowed basalt stone socket.  
**Effect on the audience:** Imparts immense architectural scale and weight; tells the viewer that behind this door sits royal power.  
**Used for and where it works best:** Entering throne rooms, opening the gates of Babylon, and unsealing treasury vaults.  
**Best in:** formats: Historical Epic, Animation | genres: History, Heritage, Fantasy  
**Avoid when:** Modern oiled brass door hinges with zero friction.  
**Example:** `foley: Deep resonant friction groan (120Hz-300Hz) with gravelly stone shavings crumbling as the door pivots.`  
`foley.palace_cedar_door`

---

### Ancient Copper Craftsman Hammer Clatter

**Also called:** metalsmith foley, coppersmith street, souk hammer  
**What it is:** Rapid, musical ping-clink of small bronze and iron hammers shaping sheet copper against stone anvils, echoing down a stone street.  
**Effect on the audience:** Immerses the audience in the vibrant, industrious prosperity of ancient Mesopotamian city life.  
**Used for and where it works best:** City background foley, artisan quarters, and bronze age forge sequences.  
**Best in:** formats: Documentary, Cultural Feature | genres: History, Heritage, Educational  
**Avoid when:** Desert battlefields or desolate ruins.  
**Example:** `foley: High resonant copper bowl ding (1.8kHz) with fast dull hammer rebound taps (4 per second).`  
**Yields to:** `soundscape.bazaar_marketplace` — Whole-city background, not the artisan quarter.  
`foley.coppersmith_hammer`

---

### Boiling Defense Pitch & Oil Cauldron

**Also called:** siege cauldron, boiling pitch simmer, rampart defense foley  
**What it is:** Thick, bubbling, viscous simmer of boiling bitumen (pitch) and sulfur in heavy bronze kettles over open cedar fires.  
**Effect on the audience:** Instills gruesome dread of ancient siege warfare; foreshadows horrific defensive violence.  
**Used for and where it works best:** Ramparts of Nineveh or Babylon preparing to repel invading siege engines.  
**Best in:** formats: War Epic, Historical Drama | genres: War, History, Horror  
**Avoid when:** Peaceful culinary kitchen scenes.  
**Example:** `foley: Thick, sluggish boiling mud/tar bubbles popping (80Hz-200Hz) + sharp fire crackle of cedar charcoal.`  
`foley.boiling_pitch_cauldron`

---

### Papyrus Scroll & Clay Bulla Seal Crack

**Also called:** scroll unroll, bulla snap, imperial dispatch foley  
**What it is:** Stiff, dry fibrous creak of unrolling aged papyrus, followed by the crisp snap of a clay bulla seal breaking apart.  
**Effect on the audience:** Connects the audience intimately to ancient legal authority and covert royal correspondence.  
**Used for and where it works best:** Reading secret decrees, international royal letters, and judicial verdicts.  
**Best in:** formats: Historical Documentary, Mystery | genres: Historical, Crime, Politics  
**Avoid when:** Unrolling modern soft synthetic parchment.  
**Example:** `foley: Dry reed fiber unroll friction + high-density baked clay seal snapping into three shards (2.5kHz crack).`  
**Yields to:** `soundscape.sfx_paper_parchment` — The same scroll-and-seal foley, era-gated.  
`foley.papyrus_and_seal_crack`

---

### Desert Night Scorpions & Insects

**Also called:** arid night foley, desert nightscape, ruin insects  
**What it is:** Delicate dry clicks of desert beetles on cracked clay, high-frequency night cicada trills, and distant jackal howls.  
**Effect on the audience:** Imparts claustrophobic nighttime vulnerability and loneliness in ancient landscapes.  
**Used for and where it works best:** Night encampments, desert escapes, and nocturnal tomb robberies.  
**Best in:** formats: Adventure, Thriller, Documentary | genres: Adventure, Suspense, Heritage  
**Avoid when:** Busy daylit city scenes.  
**Example:** `ambience: Rhythmic 8kHz cicada trill + subtle scuttling sand shift (decay 80ms) + distant lone jackal call.`  
**Source:** assumption — the package's working figure, not a published standard; set it by ear against the rendered ambience.  
**Yields to:** `foley.marsh_night_chorus` — Wetland night instead of arid night.  
`foley.desert_night_insects`

---

### River Marsh Night Chorus (Ahwar)

**Also called:** marsh frogs, Euphrates night chorus, water insect bed  
**What it is:** Dense polyphonic chorus of marsh frogs (tree frogs and bullfrogs), gentle reed rustle, and water bugs skittering.  
**Effect on the audience:** Immerses the listener in a lush, living, prehistoric wetland ecology.  
**Used for and where it works best:** Southern Iraqi marshes at twilight, Sumerian rural settlements, and nocturnal reed boat travels.  
**Best in:** formats: Nature Documentary, Cultural Heritage | genres: Heritage (civilisation-focused), Nature  
**Avoid when:** Arid mountain fortresses.  
**Example:** `ambience: Stereo frog chorus (intermittent chirps and low croaks @ 400Hz) over continuous quiet water lap.`  
**Yields to:** `foley.desert_night_insects` — Arid locations, where a frog chorus is wrong.  
`foley.marsh_night_chorus`

---

### Ancient Bronze War Horn (Shofar / Salpinx)

**Also called:** bronze war horn, ritual shofar blare, ancient trumpet  
**What it is:** Raw, guttural, non-harmonic brass blare produced by natural curved bronze horns or animal horn instruments (Shofar).  
**Effect on the audience:** Shakes the soul with ancestral alarm; communicates ritual mobilization and existential warfare.  
**Used for and where it works best:** Calling cities to arms, signaling army advances, and religious high feast days.  
**Best in:** formats: Historical Epic, Mythological Film | genres: War, Mythology, Biblical  
**Avoid when:** Modern orchestral trumpets playing European major scales.  
**Example:** `foley: Raw animal/bronze horn blare: fifth interval sweep (E3 to B3) with natural throat rasp and wide landscape reverb.`  
**Yields to:** `soundscape.ancient_battlefield` — Full battle bed, which already carries the horns.  
`foley.ancient_war_horn`

---

### Scale Armor Clatter During March

**Also called:** lamellar armor foley, soldier march rattle, bronze scale march  
**What it is:** Rhythmic, metallic clinking of hundreds of overlapping bronze or iron scales laced together on leather vests, shifting with every footstep.  
**Effect on the audience:** Demonstrates the disciplined, industrial military machine of ancient imperial superpowers (Assyria, Persia, Rome).  
**Used for and where it works best:** Marching infantry columns, parade reviews, and royal bodyguards entering rooms.  
**Best in:** formats: Historical Feature, Military Documentary | genres: War, History  
**Avoid when:** Heavy European plate armor clanks (which did not exist in antiquity).  
**Example:** `foley: Multi-layered rhythmic rattle of light bronze plates clinking together (2kHz-4kHz) synchronized with cadence.`  
**Yields to:** `soundscape.foley_ancient_garments` — Textile or linen-armoured marching bodies.  
`foley.scale_armor_march`

---

### Heavy Desert Downpour on Flat Mud-Roof

**Also called:** alluvial rain, rare desert storm, deluge foley  
**What it is:** Heavy, fat raindrops pelting packed mud-brick flat roofs, splashing into dry dusty courtyards, accompanied by distant rolling thunder.  
**Effect on the audience:** Communicates rare, life-giving yet catastrophic weather events; evokes the ancient Mesopotamian flood myth.  
**Used for and where it works best:** The Flood of Utnapishtim / Noah, winter cloudbursts, and dramatic cleansing rain after battle.  
**Best in:** formats: Mythological Epic, Historical Drama | genres: Mythology, Disaster, Heritage  
**Avoid when:** European slate roof or metal gutter dripping sounds.  
**Example:** `ambience: Dull heavy thuds of fat rain on packed earth (150Hz) transitioning into rushing clay water gutters.`  
`foley.desert_mud_roof_rain`

---

### Resinous Frankincense Brazier Crackle

**Also called:** temple brazier, incense crackle, olive oil lamp  
**What it is:** Delicate, sharp pops of frankincense and myrrh resin crystals melting and boiling on glowing cedar charcoals in bronze bowls.  
**Effect on the audience:** Evokes olfactory sensory memory; the viewer almost smells the sacred aromatics of the ancient sanctuary.  
**Used for and where it works best:** Temple interiors, royal bedchambers, and divination rituals.  
**Best in:** formats: Historical Drama, Cultural Documentary | genres: Heritage (civilisation-focused), Religion  
**Avoid when:** Modern wood campfire with exploding sap logs.  
**Example:** `foley: Gentle charcoal hiss + delicate microscopic resin pops (3kHz-8kHz) occurring at random intervals.`  
**Yields to:** `soundscape.temple_sacred_chant` — The sanctuary bed already carries the brazier.  
`foley.frankincense_brazier`

---

### Sudden Acoustic Vacuum Drop

**Also called:** the pre-shock vacuum, silence before blast, air suck drop  
**What it is:** Taking *everything* out — music, ambience and foley together — immediately before a catastrophic explosion or strike, so the detonation lands into a vacuum. The gain in perceived size comes from the contrast, not from the level of the hit: the explosion sounds enormous because the ear was straining a moment earlier. **The length of the vacuum is set on the timeline, in the edit**, against the actual cut and the actual hit.  
**Effect on the audience:** Causes the viewer's ears to strain inward during the vacuum; makes the explosion feel far larger than it measures, with no extra level.  
**Used for and where it works best:** City walls collapsing, assassination strikes, and explosive revelations. Not the same move as `score.pre_climax_score_vacuum`, which takes out the score and leaves the world running, or `sound.silence_before`, where the silence precedes a **cut** rather than an impact.  
**Best in:** formats: Feature Film, Cinematic Trailer, Action Short | genres: Action, Thriller, War  
**Avoid when:** Casual scene cuts where the silence reads as an encoding error rather than as tension.  
**Example:** `handover: everything out before the detonation, then the hit on the exact frame. Find the length in the edit — long enough to be felt, short enough that nobody checks their connection.`  
**Yields to:** `score.pre_climax_score_vacuum` — Only the score drops; the world keeps running.  
`foley.acoustic_vacuum_drop`