Add per-node scene music volume control

Author a music track and volume (0-100%) per story node; the runtime
scales it to 0-1 and applies it without restarting the track when only
the level changes. Adds migration 024, threads music_volume through the
repository/runtime, and gives the node inspector a volume slider.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

migrations/024_story_node_music_volume.sql

@@ -0,0 +1,4 @@
+-- Per-node scene-music volume (0-100%). Applied whenever a node sets a track;
+-- selecting the same track on a later node with a different volume just adjusts
+-- the level without restarting the music.
+ALTER TABLE osint.story_nodes ADD COLUMN music_volume SMALLINT NOT NULL DEFAULT 100 CHECK (music_volume BETWEEN 0 AND 100);

server/migrations.integration.test.ts

@@ -33,7 +33,7 @@ suite('PostgreSQL migrations', () => {
     const migrationsDir = path.resolve(path.dirname(fileURLToPath(import.meta.url)), '..', 'migrations')
     const firstRun: string[] = []
     await runMigrations(testDatabaseUrl, migrationsDir, message => firstRun.push(message))
-    expect(firstRun.filter(message => message.startsWith('apply '))).toHaveLength(23)
+    expect(firstRun.filter(message => message.startsWith('apply '))).toHaveLength(24)
 
     const client = new Client({ connectionString: testDatabaseUrl })
     await client.connect()
@@ -49,7 +49,7 @@ suite('PostgreSQL migrations', () => {
     ]))
     expect(tableNames).not.toEqual(expect.arrayContaining(['cases', 'widgets', 'widget_relations', 'cutscenes', 'dialogue_steps', 'mystery_chapters', 'seen_dialogue']))
     const ledger = await client.query<{ count: string }>('SELECT COUNT(*)::text AS count FROM osint.schema_migrations')
-    expect(ledger.rows[0].count).toBe('23')
+    expect(ledger.rows[0].count).toBe('24')
     const connectionColumns = await client.query<{ column_name: string }>(`SELECT column_name FROM information_schema.columns WHERE table_schema='osint' AND table_name='exhibit_connections'`)
     expect(connectionColumns.rows.map(row => row.column_name)).toEqual(expect.arrayContaining(['label', 'tightness', 'tag_style', 'tag_position_percent', 'tag_lateral_offset']))
     const eventOccurrence = await client.query<{ is_nullable: string }>(`SELECT is_nullable FROM information_schema.columns WHERE table_schema='osint' AND table_name='event_exhibits' AND column_name='occurred_at'`)
@@ -58,7 +58,7 @@ suite('PostgreSQL migrations', () => {
 
     const secondRun: string[] = []
     await runMigrations(testDatabaseUrl, migrationsDir, message => secondRun.push(message))
-    expect(secondRun.filter(message => message.startsWith('skip  '))).toHaveLength(23)
+    expect(secondRun.filter(message => message.startsWith('skip  '))).toHaveLength(24)
     expect(secondRun.some(message => message.startsWith('apply '))).toBe(false)
   })
 })

server/narrativeRepository.ts

@@ -16,7 +16,7 @@ export type RuntimeUtterance = {
 }
 export type RuntimeNode = {
   id: string; kind: 'cutscene' | 'dialogue' | 'level'; label: string
-  componentKey?: string | null; levelSlug?: string | null; musicUrl?: string | null
+  componentKey?: string | null; levelSlug?: string | null; musicUrl?: string | null; musicVolume?: number
   utterances?: RuntimeUtterance[]; rootId?: string | null
 }
 export type PlaythroughState = { playthrough: PlaythroughSummary; node: RuntimeNode | null }
@@ -60,7 +60,7 @@ export interface NarrativeRepository {
   deletePose(npcId: string, poseKey: string): Promise<NpcDto | null>
 }
 
-type GraphNodeRow = { id: string; node_type: string; label: string; component_key: string | null; level_template_version_id: string | null; music_asset_id: string | null }
+type GraphNodeRow = { id: string; node_type: string; label: string; component_key: string | null; level_template_version_id: string | null; music_asset_id: string | null; music_volume: number }
 
 export function createNarrativeRepository(pool: Pool, objectStorage: ObjectStorage): NarrativeRepository {
   // ---- Runtime: walking the story graph -------------------------------------
@@ -97,12 +97,13 @@ export function createNarrativeRepository(pool: Pool, objectStorage: ObjectStora
   }
 
   async function resolveNodeForPlay(nodeId: string, levelSlug: string | null): Promise<RuntimeNode | null> {
-    const node = (await pool.query<GraphNodeRow>('SELECT id,node_type,label,component_key,level_template_version_id,music_asset_id FROM osint.story_nodes WHERE id=$1', [nodeId])).rows[0]
+    const node = (await pool.query<GraphNodeRow>('SELECT id,node_type,label,component_key,level_template_version_id,music_asset_id,music_volume FROM osint.story_nodes WHERE id=$1', [nodeId])).rows[0]
     if (!node) return null
     const musicUrl = node.music_asset_id ? `/api/assets/${node.music_asset_id}` : null
-    if (node.node_type === 'cutscene') return { id: node.id, kind: 'cutscene', label: node.label, componentKey: node.component_key, musicUrl }
-    if (node.node_type === 'level') return { id: node.id, kind: 'level', label: node.label, levelSlug, musicUrl }
-    if (node.node_type === 'dialogue') return { id: node.id, kind: 'dialogue', label: node.label, musicUrl, ...(await resolveDialogueGraph(node.id)) }
+    const musicVolume = node.music_volume / 100
+    if (node.node_type === 'cutscene') return { id: node.id, kind: 'cutscene', label: node.label, componentKey: node.component_key, musicUrl, musicVolume }
+    if (node.node_type === 'level') return { id: node.id, kind: 'level', label: node.label, levelSlug, musicUrl, musicVolume }
+    if (node.node_type === 'dialogue') return { id: node.id, kind: 'dialogue', label: node.label, musicUrl, musicVolume, ...(await resolveDialogueGraph(node.id)) }
     return null // gates are auto-resolved during advance and never surfaced
   }
 

server/storyGraphRepository.ts

@@ -13,7 +13,7 @@ export type StoryNodeType = 'cutscene' | 'dialogue' | 'level' | 'det_gate' | 'll
 export type TerminalDto = { id: string; terminalKey: string; label: string; toNodeId: string | null; sortOrder: number }
 export type StoryNodeDto = {
   id: string; nodeType: StoryNodeType; label: string; hasUtterances: boolean
-  xpos: number; ypos: number; levelTemplateVersionId: string | null; componentKey: string | null; musicAssetId: string | null
+  xpos: number; ypos: number; levelTemplateVersionId: string | null; componentKey: string | null; musicAssetId: string | null; musicVolume: number
   terminals: TerminalDto[]
 }
 export type StoryGraphDto = { mysteryId: string; entryNodeId: string | null; nodes: StoryNodeDto[] }
@@ -37,7 +37,7 @@ const DEFAULT_TERMINALS: Record<StoryNodeType, { key: string; label: string }[]>
 export interface StoryGraphRepository {
   getGraph(mysteryId: string): Promise<StoryGraphDto | null>
   createNode(mysteryId: string, input: { nodeType: StoryNodeType; xpos: number; ypos: number; label?: string }): Promise<StoryNodeDto | null>
-  updateNode(nodeId: string, input: Partial<{ label: string; xpos: number; ypos: number; hasUtterances: boolean; componentKey: string | null; levelTemplateVersionId: string | null; musicAssetId: string | null }>): Promise<StoryNodeDto | null>
+  updateNode(nodeId: string, input: Partial<{ label: string; xpos: number; ypos: number; hasUtterances: boolean; componentKey: string | null; levelTemplateVersionId: string | null; musicAssetId: string | null; musicVolume: number }>): Promise<StoryNodeDto | null>
   deleteNode(nodeId: string): Promise<boolean>
   addTerminal(nodeId: string, input: { terminalKey: string; label?: string }): Promise<StoryNodeDto | null>
   updateTerminal(terminalId: string, input: Partial<{ label: string; sortOrder: number; toNodeId: string | null }>): Promise<{ ok: boolean; error?: string }>
@@ -61,8 +61,8 @@ export function createStoryGraphRepository(pool: Pool): StoryGraphRepository {
     const mystery = await pool.query<{ id: string; entry_node_id: string | null }>('SELECT id,entry_node_id FROM osint.mysteries WHERE id=$1', [mysteryId])
     if (!mystery.rows[0]) return null
     const [nodes, terminals] = await Promise.all([
-      pool.query<{ id: string; node_type: StoryNodeType; label: string; has_utterances: boolean; xpos: number; ypos: number; level_template_version_id: string | null; component_key: string | null; music_asset_id: string | null }>(
-        'SELECT id,node_type,label,has_utterances,xpos,ypos,level_template_version_id,component_key,music_asset_id FROM osint.story_nodes WHERE mystery_id=$1 ORDER BY created_at', [mysteryId]),
+      pool.query<{ id: string; node_type: StoryNodeType; label: string; has_utterances: boolean; xpos: number; ypos: number; level_template_version_id: string | null; component_key: string | null; music_asset_id: string | null; music_volume: number }>(
+        'SELECT id,node_type,label,has_utterances,xpos,ypos,level_template_version_id,component_key,music_asset_id,music_volume FROM osint.story_nodes WHERE mystery_id=$1 ORDER BY created_at', [mysteryId]),
       pool.query<{ id: string; parent_node_id: string; terminal_key: string; label: string; to_node_id: string | null; sort_order: number }>(
         `SELECT t.id,t.parent_node_id,t.terminal_key,t.label,t.to_node_id,t.sort_order FROM osint.story_node_terminals t
          JOIN osint.story_nodes n ON n.id=t.parent_node_id WHERE n.mystery_id=$1 ORDER BY t.sort_order,t.terminal_key`, [mysteryId]),
@@ -77,7 +77,7 @@ export function createStoryGraphRepository(pool: Pool): StoryGraphRepository {
       mysteryId, entryNodeId: mystery.rows[0].entry_node_id,
       nodes: nodes.rows.map(row => ({
         id: row.id, nodeType: row.node_type, label: row.label, hasUtterances: row.has_utterances,
-        xpos: row.xpos, ypos: row.ypos, levelTemplateVersionId: row.level_template_version_id, componentKey: row.component_key, musicAssetId: row.music_asset_id,
+        xpos: row.xpos, ypos: row.ypos, levelTemplateVersionId: row.level_template_version_id, componentKey: row.component_key, musicAssetId: row.music_asset_id, musicVolume: row.music_volume,
         terminals: byNode.get(row.id) || [],
       })),
     }
@@ -118,6 +118,7 @@ export function createStoryGraphRepository(pool: Pool): StoryGraphRepository {
       if (input.componentKey !== undefined) set('component_key', input.componentKey || null)
       if (input.levelTemplateVersionId !== undefined) set('level_template_version_id', input.levelTemplateVersionId || null)
       if (input.musicAssetId !== undefined) set('music_asset_id', input.musicAssetId || null)
+      if (input.musicVolume !== undefined) set('music_volume', Math.max(0, Math.min(100, Math.round(input.musicVolume))))
       if (sets.length) await pool.query(`UPDATE osint.story_nodes SET ${sets.join(',')} WHERE id=$1`, values)
       const graph = await loadGraph(mysteryId)
       return graph?.nodes.find(node => node.id === nodeId) ?? null

src/App.tsx

@@ -155,7 +155,7 @@ export function App() {
 
   // Scene music follows the current node (null inherits; a finished playthrough stops).
   useEffect(() => {
-    if (runtimeNode?.musicUrl) audio.setMusic(runtimeNode.musicUrl)
+    if (runtimeNode?.musicUrl) audio.setMusic(runtimeNode.musicUrl, runtimeNode.musicVolume)
     else if (playthrough?.status === 'finished') audio.setMusic(null)
   }, [runtimeNode, playthrough])
 

src/audio.ts

@@ -2,7 +2,7 @@
 // SFX. Zero dependencies. Browsers block autoplay until a user gesture, so music/SFX
 // are primed on the first pointer interaction.
 type Sfx = 'advance' | 'choice' | 'sting'
-const MUSIC_VOLUME = 0.5
+let baseVolume = 0.5 // authored scene volume (0-1); mute overrides to 0
 
 let ctx: AudioContext | null = null
 function audioContext() {
@@ -43,13 +43,16 @@ function fade(target: number, done?: () => void) {
 function startMusic() {
   if (!music || !currentUrl || muted) return
   const promise = music.play()
-  if (promise) promise.then(() => { pending = false; fade(MUSIC_VOLUME) }).catch(() => { pending = true })
+  if (promise) promise.then(() => { pending = false; fade(baseVolume) }).catch(() => { pending = true })
 }
 
 export const audio = {
   // A null url inherits whatever is already playing; a new url crossfades to it.
-  setMusic(url: string | null) {
-    if (!music || url === currentUrl) return
+  // The same url with a new volume just adjusts the level (no restart).
+  setMusic(url: string | null, volume?: number) {
+    if (!music) return
+    if (volume !== undefined) baseVolume = Math.max(0, Math.min(1, volume))
+    if (url === currentUrl) { if (volume !== undefined && currentUrl && !muted) fade(baseVolume); return }
     currentUrl = url
     if (!url) { fade(0, () => music.pause()); pending = false; return }
     music.src = url
@@ -59,7 +62,7 @@ export const audio = {
   toggleMute() {
     muted = !muted
     if (muted) fade(0)
-    else if (currentUrl) startMusic()
+    else if (currentUrl) { if (music && music.paused) startMusic(); else fade(baseVolume) }
     return muted
   },
   isMuted() { return muted },

src/mysteryGraph.tsx

@@ -4,7 +4,7 @@ import { CUTSCENE_COMPONENT_KEYS, DialoguePreview } from './narrative'
 
 type StoryNodeType = 'cutscene' | 'dialogue' | 'level' | 'det_gate' | 'llm_gate'
 type Terminal = { id: string; terminalKey: string; label: string; toNodeId: string | null; sortOrder: number }
-type StoryNode = { id: string; nodeType: StoryNodeType; label: string; hasUtterances: boolean; xpos: number; ypos: number; levelTemplateVersionId: string | null; componentKey: string | null; musicAssetId: string | null; terminals: Terminal[] }
+type StoryNode = { id: string; nodeType: StoryNodeType; label: string; hasUtterances: boolean; xpos: number; ypos: number; levelTemplateVersionId: string | null; componentKey: string | null; musicAssetId: string | null; musicVolume: number; terminals: Terminal[] }
 type AudioAsset = { id: string; originalName: string; mimeType: string }
 type Graph = { mysteryId: string; entryNodeId: string | null; nodes: StoryNode[] }
 type LevelTemplate = { versionId: string; slug: string; name: string; version: number }
@@ -182,6 +182,7 @@ function NodeInspector({ node, graph, templates, audioAssets, onPatch, onSetEntr
 }) {
   const [label, setLabel] = useState(node.label)
   const [componentKey, setComponentKey] = useState(node.componentKey || '')
+  const [volume, setVolume] = useState(node.musicVolume)
   const nodeName = (id: string | null) => id ? (graph.nodes.find(n => n.id === id)?.label || '—') : '— unwired —'
   const usesComponent = node.nodeType === 'cutscene' || node.nodeType === 'det_gate' || node.nodeType === 'llm_gate'
   return <div className="inspector-body">
@@ -204,6 +205,10 @@ function NodeInspector({ node, graph, templates, audioAssets, onPatch, onSetEntr
         {audioAssets.map(asset => <option key={asset.id} value={asset.id}>{asset.originalName}</option>)}
       </select>
     </label>
+    {node.musicAssetId && <label className="ins-field"><span>Volume {volume}%</span>
+      <input type="range" min={0} max={100} value={volume} onChange={e => setVolume(Number(e.target.value))}
+        onPointerUp={() => volume !== node.musicVolume && onPatch({ musicVolume: volume })} onBlur={() => volume !== node.musicVolume && onPatch({ musicVolume: volume })} />
+    </label>}
 
     <div className="ins-terminals-head"><span>Output terminals</span><button onClick={onAddTerminal}>+ Add</button></div>
     {node.terminals.map(t => <div key={t.id} className="ins-terminal">

src/narrative.tsx

@@ -2,7 +2,7 @@ import { useEffect, useMemo, useRef, useState, type FC } from 'react'
 import { audio } from './audio'
 
 export type RuntimeUtterance = { id: string; utterer: 'npc' | 'player'; speaker: { name: string; role: string }; poseUrl: string | null; text: string; childIds: string[]; terminalKey: string | null }
-export type RuntimeNode = { id: string; kind: 'cutscene' | 'dialogue' | 'level'; label: string; componentKey?: string | null; levelSlug?: string | null; musicUrl?: string | null; utterances?: RuntimeUtterance[]; rootId?: string | null }
+export type RuntimeNode = { id: string; kind: 'cutscene' | 'dialogue' | 'level'; label: string; componentKey?: string | null; levelSlug?: string | null; musicUrl?: string | null; musicVolume?: number; utterances?: RuntimeUtterance[]; rootId?: string | null }
 export type PlaythroughSummary = { id: string; mysterySlug: string; levelSlug: string | null; status: string }
 export type PlaythroughState = { playthrough: PlaythroughSummary; node: RuntimeNode | null }