v0.19.0 — SFX playlists are flat, playlist-sourced banks removed - #17
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`createSoundBank({ playlist_id = ... })` is gone, along with the `slots` field
on the playlist response and the `label` field on each playlist sound.
The slot layer was never used. Across the whole catalog only two playlists ever
carried a slot label and both were tests — every real SFX playlist is flat, and
organises by having more than one playlist ("ObbySounds: Hits",
"LittleMonsters-Vocalizations", "BigScreech"), where the playlist name is the
role. The mode was also inert by construction: an unlabelled sound became its
own slot, so a flat playlist resolved to pools of exactly one and `pick` had
nothing to choose between.
Variation for a single sound is what Audio Packs are for — layers with
per-variation gain, cuts and fades.
Seed-based banks are unchanged and remain the way to expand one asset into a
pool of neighbours.
The Open Cloud smoke keeps integration coverage on both halves: it asserts the
`slots` field is genuinely absent (a regression would bring it back) and that
the replacement path works end to end — read an SFX playlist, seed a bank from
one of its sounds, resolve it against the real catalog and pick without repeats.
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July 28, 2026 22:07 — with 
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Why
createSoundBank({ playlist_id = ... })shipped in v0.18.0 and never worked in practice.An unlabelled sound became its own slot, so a flat playlist resolved to pools of exactly one —
pickhad nothing to choose between. And every real SFX playlist is flat: across the catalog only two ever carried a slot label, both tests. Developers organise by having more than one playlist —ObbySounds: Hits,LittleMonsters-Vocalizations,BigScreech— where the playlist name is the role. The slot layer duplicated the container above it.Variation for a single sound is what Audio Packs are for: layers with per-variation gain, cuts and fades.
Removed
createSoundBank({ playlist_id = ... })and the_resolveFromPlaylistpathPlaylistSlottype andPlaylistInfo.slotsPlaylistSound.labelseedsis now the only sound-bank source. Seed-based banks are unchanged — expanding one asset into a pool of catalog neighbours is untouched, and remains the runtime answer to the machine-gun effect.Integration coverage
The Open Cloud smoke keeps both halves under test against the real API and the real engine:
getPlaylist (sfx)assertsplaylist.slots == niland that no sound carries alabel— a regression that reintroduces grouping fails here rather than silently returning a shape nobody reads.createSoundBank (playlist source removed)asserts the removed option is genuinely rejected, then exercises what replaces it: read an SFX playlist, seed a bank from one of its sounds, resolve against the live catalog, and pick 20 times without an immediate repeat.Verification
Full CI gauntlet run locally:
stylua --check,selene(0 errors, 0 warnings),luau-lsp analyze(0 parse errors), 21 unit specs pass, and thewally package --listsnapshot matchestests/wally-package.expected.txt.The install-snippet spec caught the README version pin during the bump, which is what it's for.