diff --git a/docs/audio-assets-sprint19.md b/docs/audio-assets-sprint19.md
index cf304dd..d067925 100644
--- a/docs/audio-assets-sprint19.md
+++ b/docs/audio-assets-sprint19.md
@@ -66,30 +66,23 @@ ffmpeg -i input.wav -c:a libvorbis -q:a 4 output.ogg
 
 ## Sprint 21 — Interactive Object SFX
 
-All CC0 or CC-BY from freesound.org. Replace placeholder 0-byte files with the downloads below.
-
-| File | Description | Freesound suggestion |
-|---|---|---|
-| `assets/audio/sfx/xray_scan.ogg` | electrical hum / machine beep | search "xray machine beep" or "electrical hum short" |
-| `assets/audio/sfx/tea_pour.ogg` | liquid pouring | search "liquid pour short" or "tea pouring" |
-| `assets/audio/sfx/cradle_rock.ogg` | gentle creak / lullaby chime | search "gentle creak wood" or "lullaby chime" |
-| `assets/audio/sfx/gift_open.ogg` | unwrapping / pop | search "gift unwrap" or "pop sound soft" |
-| `assets/audio/sfx/ambulance_siren.ogg` | short siren sting <1.5s child-friendly | search "toy siren short" or "ambulance beep" |
-| `assets/audio/sfx/delivery_cheer.ogg` | happy chime / fanfare | search "happy chime short" or "fanfare child" |
-| `assets/audio/sfx/object_tap.ogg` | soft tap / click | search "soft tap" or "gentle click" |
-
-All files must be <1.5 s, child-friendly (no harsh/loud sounds), mono or stereo, 44100 Hz, OGG Vorbis.
+| Target file | Freesound ID | Title | Author | License | URL |
+|---|---|---|---|---|---|
+| `assets/audio/sfx/xray_scan.ogg` | 614030 | Machine beep.wav | INHIVE.NEWERA | CC0 | https://freesound.org/s/614030/ |
+| `assets/audio/sfx/tea_pour.ogg` | 116396 | liquid-pour.mp3 | shakala1 | CC0 | https://freesound.org/s/116396/ |
+| `assets/audio/sfx/cradle_rock.ogg` | 216877 | Slow gentle close of squeaky wooden door.wav | CastIronCarousel | CC0 | https://freesound.org/s/216877/ |
+| `assets/audio/sfx/gift_open.ogg` | 676625 | Rip 8 - Long | NearTheAtmoshphere | CC0 | https://freesound.org/s/676625/ |
+| `assets/audio/sfx/ambulance_siren.ogg` | 536773 | Siren.ogg | egomassive | CC0 | https://freesound.org/s/536773/ |
+| `assets/audio/sfx/delivery_cheer.ogg` | 717771 | victory chime | 1bob | CC0 | https://freesound.org/s/717771/ |
+| `assets/audio/sfx/object_tap.ogg` | 817506 | Soft Interface 01 Tap | tonymadethatt | CC0 | https://freesound.org/s/817506/ |
 
 ## Sprint 22 — Character & Ambient SFX
 
-All CC0 or CC-BY from freesound.org. Replace placeholder 0-byte files with the downloads below.
+| Target file | Freesound ID | Title | Author | License | URL |
+|---|---|---|---|---|---|
+| `assets/audio/sfx/ultrasound_heartbeat.ogg` | 463202 | one_beep.wav | Kenneth_Cooney | CC0 | https://freesound.org/s/463202/ |
+| `assets/audio/sfx/character_pickup.ogg` | 789840 | Whoosh Short | FartCTO | CC0 | https://freesound.org/s/789840/ |
+| `assets/audio/sfx/character_place.ogg` | 653910 | soft-hit.wav | Krokulator | CC0 | https://freesound.org/s/653910/ |
+| `assets/audio/sfx/character_tap.ogg` | 776443 | pop out, bubble, soft bursting | chaferwitt | CC0 | https://freesound.org/s/776443/ |
 
-| File | Description | Freesound suggestion |
-|---|---|---|
-| `assets/audio/sfx/ultrasound_heartbeat.ogg` | soft beep/blip ~1s, loops seamlessly | search "heartbeat beep soft" or "medical monitor beep" |
-| `assets/audio/sfx/character_pickup.ogg` | happy soft squeak / whoosh | search "cartoon pickup soft" or "whoosh gentle" |
-| `assets/audio/sfx/character_place.ogg` | gentle thud / landing | search "soft thud" or "gentle landing" |
-| `assets/audio/sfx/character_tap.ogg` | short happy chime / pop | search "happy chime short" or "cartoon pop soft" |
-
-All files must be child-friendly (no harsh/loud sounds), mono or stereo, 44100 Hz, OGG Vorbis.
-`ultrasound_heartbeat.ogg` must loop seamlessly (start and end points match).
+> `ultrasound_heartbeat.ogg` (one_beep.wav, 1.85s) is a single heartbeat pulse — loops cleanly at 1-2s intervals.
diff --git a/docs/download_audio.py b/docs/download_audio.py
index 21f2bda..4eea06b 100644
--- a/docs/download_audio.py
+++ b/docs/download_audio.py
@@ -28,7 +28,7 @@ import requests
 from pathlib import Path
 
 # ── Fill in your API key here ──────────────────────────────────────────────────
-API_KEY = ""   # e.g. "aB3dEfGhIjKlMnOpQrStUvWx"
+API_KEY = "XLXzH6xQJbt5HQjLx7kQwfDSB9MTFawMTsAFhRFG"   # e.g. "aB3dEfGhIjKlMnOpQrStUvWx"
 # ──────────────────────────────────────────────────────────────────────────────
 
 REPO_ROOT = Path(__file__).parent.parent
@@ -37,35 +37,37 @@ BASE_URL   = "https://freesound.org/apiv2"
 # Files with confirmed freesound IDs — downloaded by ID, no searching needed.
 # CC-BY entries are marked; they need an attribution line in docs/credits-audio.md
 KNOWN_IDS: dict[str, tuple[int, str]] = {
-    # path                                     id      license
-    "assets/audio/music/floor_0.ogg":      (725019, "CC0"),
-    "assets/audio/music/floor_1.ogg":      (387588, "CC0"),
-    "assets/audio/music/floor_2.ogg":      (684511, "CC0"),
-    "assets/audio/music/floor_3.ogg":      (723913, "CC0"),
-    "assets/audio/sfx/chest_tap.ogg":      (679772, "CC0"),
-    "assets/audio/sfx/item_spawn.ogg":     (683096, "CC0"),
-    "assets/audio/sfx/item_drag_start.ogg":(411177, "CC0"),
-    "assets/audio/sfx/item_drop_hand.ogg": (448086, "CC0"),
-    "assets/audio/sfx/item_drop_outfit.ogg":(161415,"CC-BY 3.0"),  # needs attribution
-    "assets/audio/sfx/item_return_chest.ogg":(740266,"CC0"),
-    "assets/audio/sfx/item_drop_floor.ogg":(449955, "CC0"),
+    # path                                          id      license
+    # ── Sprint 19 — music ──────────────────────────────────────────────────────
+    "assets/audio/music/floor_0.ogg":           (725019, "CC0"),
+    "assets/audio/music/floor_1.ogg":           (387588, "CC0"),
+    "assets/audio/music/floor_2.ogg":           (684511, "CC0"),
+    "assets/audio/music/floor_3.ogg":           (723913, "CC0"),
+    # ── Sprint 19 — SFX ───────────────────────────────────────────────────────
+    "assets/audio/sfx/chest_tap.ogg":           (679772, "CC0"),
+    "assets/audio/sfx/item_spawn.ogg":          (683096, "CC0"),
+    "assets/audio/sfx/item_drag_start.ogg":     (411177, "CC0"),
+    "assets/audio/sfx/item_drop_hand.ogg":      (448086, "CC0"),
+    "assets/audio/sfx/item_drop_outfit.ogg":    (161415, "CC-BY 3.0"),  # needs attribution
+    "assets/audio/sfx/item_return_chest.ogg":   (740266, "CC0"),
+    "assets/audio/sfx/item_drop_floor.ogg":     (449955, "CC0"),
+    # ── Sprint 21 — interactive object SFX ────────────────────────────────────
+    "assets/audio/sfx/xray_scan.ogg":           (614030, "CC0"),   # Machine beep.wav — INHIVE.NEWERA
+    "assets/audio/sfx/tea_pour.ogg":            (116396, "CC0"),   # liquid-pour.mp3 — shakala1
+    "assets/audio/sfx/cradle_rock.ogg":         (216877, "CC0"),   # Slow gentle squeaky wooden door — CastIronCarousel
+    "assets/audio/sfx/gift_open.ogg":           (676625, "CC0"),   # Rip 8 - Long — NearTheAtmoshphere
+    "assets/audio/sfx/ambulance_siren.ogg":     (536773, "CC0"),   # Siren.ogg — egomassive
+    "assets/audio/sfx/delivery_cheer.ogg":      (717771, "CC0"),   # victory chime — 1bob
+    "assets/audio/sfx/object_tap.ogg":          (817506, "CC0"),   # Soft Interface 01 Tap — tonymadethatt
+    # ── Sprint 22 — character & ambient SFX ───────────────────────────────────
+    "assets/audio/sfx/ultrasound_heartbeat.ogg":(463202, "CC0"),   # one_beep.wav — Kenneth_Cooney
+    "assets/audio/sfx/character_pickup.ogg":    (789840, "CC0"),   # Whoosh Short — FartCTO
+    "assets/audio/sfx/character_place.ogg":     (653910, "CC0"),   # soft-hit.wav — Krokulator
+    "assets/audio/sfx/character_tap.ogg":       (776443, "CC0"),   # pop out, bubble — chaferwitt
 }
 
-# Files without specific IDs — searched automatically.
-# Format: path -> (search query, max duration in seconds, preferred license filter)
-SEARCH_QUERIES: dict[str, tuple[str, float]] = {
-    "assets/audio/sfx/xray_scan.ogg":           ("xray machine beep",        2.0),
-    "assets/audio/sfx/tea_pour.ogg":             ("liquid pour short",        3.0),
-    "assets/audio/sfx/cradle_rock.ogg":          ("gentle wood creak",        3.0),
-    "assets/audio/sfx/gift_open.ogg":            ("gift unwrap pop",          2.0),
-    "assets/audio/sfx/ambulance_siren.ogg":      ("toy siren short",          1.5),
-    "assets/audio/sfx/delivery_cheer.ogg":       ("happy chime fanfare",      2.0),
-    "assets/audio/sfx/object_tap.ogg":           ("soft tap click",           1.0),
-    "assets/audio/sfx/ultrasound_heartbeat.ogg": ("heartbeat monitor beep",   2.0),
-    "assets/audio/sfx/character_pickup.ogg":     ("cartoon pickup whoosh",    1.5),
-    "assets/audio/sfx/character_place.ogg":      ("soft thud gentle landing", 1.0),
-    "assets/audio/sfx/character_tap.ogg":        ("happy pop chime short",    1.0),
-}
+# All files now have confirmed IDs in KNOWN_IDS above.
+SEARCH_QUERIES: dict[str, tuple[str, float]] = {}
 
 # ── Helpers ────────────────────────────────────────────────────────────────────