# HomuraHime Audio System Analysis

## Game Overview
- **Engine**: Unity 2022.3.x
- **Audio Engine**: FMOD Studio 2.02.x with Google Resonance spatial audio
- **Voice Manager**: UtageFmodVoiceManager (adapted Utage framework)
- **Platform**: Steam (uses Steamworks.NET)

## Audio Architecture

### Directory Structure
```
HomuraHime_Data\
├── Managed\
│   ├── Assembly-CSharp.dll          (7.08 MB - main game logic)
│   ├── Assembly-CSharp-firstpass.dll (3.92 MB - runtime code)
│   ├── FMODUnity.dll               (239 KB - FMOD Unity integration)
│   ├── FMODUnityResonance.dll      (11 KB - FMOD Resonance extension)
│   └── UnityEngine.AudioModule.dll
├── Plugins\x86_64\
│   ├── fmodstudio.dll              (3.16 MB - FMOD core)
│   └── resonanceaudio.dll          (817 KB - Google Resonance spatial)
└── StreamingAssets\FMOD\Desktop\
    └── (49 FMOD bank files - ~1.3 GB total)
```

### FMOD Bank Files

| Bank | Purpose | Size (streams) |
|------|---------|----------------|
| Master.bank | Main mixer and routing | 98.5 KB |
| BGM.bank | Background music (general) | 63.83 MB |
| BGM_Default.bank | Default BGM | 224.07 MB |
| BGM_Hub.bank | Hub area music | 14.67 MB |
| BGM_Lv0-Lv5, BGM_LvF | Level-specific music | 14-64 MB each |
| Ambience.bank | Environmental sounds | 150.97 MB |
| SFX.bank | Sound effects | 188.97 MB |
| Voice.bank | Character voice | 19.83 MB |
| PreLoad_Jump.bank | Pre-cached jump sounds | ~533 KB |
| PreLoad_FootStep_Land.bank | Pre-cached footstep sounds | ~1 MB |

**Total Audio: ~1.3 GB across 49 bank files**

## Key Audio Classes

### Voice Management
- **UtageFmodVoiceManager** - Main voice manager (Utage framework adapted)
- **CFVoiceData** / **CFVoiceEventUtility** - Custom voice event system
- **CharacterVoiceData** - Character voice data handling
- **FmodVoiceStopper** - Voice stop controller
- **get_CountVoice** / **get_IsPlayingVoice** - Voice count monitoring

### Sound Management
- **FMODSoundManager** - Main FMOD sound manager
- **SoundManager** (Utage base) - Base sound manager
- **FmodSFXEventSO**, **FmodSFXEventRef**, **FmodSFXEventDispatcher** - Custom SFX system
- **FMODEventInstance** - FMOD event instance wrapper

### Channel/Volume Control
- **FMOD_Channel** - Custom FMOD channel wrapper
- **VCASetting** - Volume control area settings
- **TaggedMasterVolume** - Per-tag master volume control
- **BGMChannel** - BGM channel management

### Audio Effects
- **UpdateDucking** / **DuckVolume** - Audio ducking system
- **SnapshotManager** - Snapshot management
- **FmodReverbEventController** - Reverb control
- **ZoneReverbHandler** - Zone-based reverb

### Spatial Audio
- **HHFmodListenerPosController** - FMOD listener position controller
- **resonanceaudio.dll** - Google Resonance spatial audio

### Pooling
- **SimplePool** / **ObjectPool** - Generic object pooling
- **DEFAULT_POOL_SIZE**, **VfxObjectPoolSize** - Pool size constants

## Voice Event Constants (CFVOICE Events)

The game triggers voice events for various situations:
- `CFVOICE_REWARD` - Reward sounds
- `CFVOICE_CHALLENGEBATTLE` - Challenge battle start
- `CFVOICE_BATTLE` - Battle start
- `CFVOICE_NOTE` - Note/commentary
- `CFVOICE_MHCHASING` - Chasing sequences
- `CFVOICE_ELECTRIFYING` - Electrifying events
- `CFVOICE_HH` / `HH_Behaviour` - HomuraHime behavior events
- `CFVOICE_ENEMY` - Enemy-related voice
- `CFVOICE_QTE_SHIKIGAMI` - QTE shikigami events
- `CFVOICE_BATTLERANK` - Battle rank announcements
- And many more...

## Enemy System

### Enemy Audio Triggers
- **EnemyBehaviorManger** - Enemy behavior management
- **EnemyAttackBase**, **EnemyAttackAction**, **EnemyAttackBlockedAction** - Attack handling
- **EnemyIndicatorController** - Visual indicators for enemies
- **SetEnemyAI** - AI setting method
- **EnemyState** - Enemy state tracking

### HUD/Indicator Classes
- **HUDIndicatorPhase** / **HUDIndicatorPhaseHandler** - Phase indicator handling
- **CDHUDIndicatorHandler** - Cooldown HUD indicator
- **IndicatorManager** - Indicator management

## Audio Configuration

### Pool-Related Constants
- `DEFAULT_POOL_SIZE` - Default pool size
- `VfxObjectPoolSize` - VFX pool size
- `ObjectPoolSize` - Generic object pool size
- `poolPreloadnum` - Pool preload count
- `preloadCountPerPrefab` - Per-prefab preload count

### FMOD Channel Constants
- `MAXCHANNELS` - Maximum channel count
- `ERR_TOOMANYCHANNELS` - Channel overflow error
- `ERR_CHANNEL_ALLOC` - Channel allocation error
- `VIRTUALVOICE` - Virtual voice management
- `CHANNELPRIORITY` - Channel priority setting
- `MAX_CHANNEL_WIDTH` - Maximum channel width

## Key Findings

1. **No explicit voice limit constants** visible in string analysis - voice limit may be managed internally by FMOD or Utage framework
2. **Audio ducking system exists** - `UpdateDucking` and `DuckVolume` present
3. **Voice pooling exists** - Object pooling with `DEFAULT_POOL_SIZE` constants
4. **Lip-sync support** - Using `uLipSyncFMOD` for voice synchronization
5. **Priority system** - `CHANNELPRIORITY` and `Priority` fields for channel prioritization
6. **Event-driven voice system** - Voices triggered via CFVOICE event constants

## Source File Paths (from DLL strings)

These are the original Unity asset paths in the game source:
- `Assets/4.Developer/Andy/UtageVoiceManager/UtageFmodVoiceManager.cs`
- `Assets/4.Developer/Andy/UtageVoiceManager/UtageFmodVoiceSetting.cs`
- `Assets/4.Developer/Andy/UtageVoiceManager/FmodVoiceStopper.cs`
- `Assets/4.Developer/Andy/UtageVoiceManager/DEAudioFadeManager.cs`
- `Assets/4.Developer/Andy/UtageVoiceManager/SnapshotManager.cs`
- `Assets/4.Developer/Andy/UtageVoiceManager/FmodReverbEventController.cs`
- `Assets/1.HonoHime/Core/FMODUtility/Scripts/FMODSoundManager.cs`
- `Assets/1.HonoHime/Core/FMODUtility/Scripts/MMFeedbacks/FMOD_Channel.cs`
- `Assets/1.HonoHime/Core/mLibrary/ObjectPool/SimplePool.cs`

## Game Data Files

Audio-related configuration may exist in:
- `HomuraHime_Data\StreamingAssets\HomuraHimeData\csv\EnemyData.json`
- `HomuraHime_Data\StreamingAssets\HomuraHimeData\json\BattleRound.json`
- `HomuraHime_Data\StreamingAssets\HomuraHimeData\json\EnemyData.json`

## Potential Audio Glitch Causes

Based on architecture analysis:

1. **Voice Limit Exhaustion** - Too many simultaneous FMOD events
2. **Missing Audio Ducking Rules** - No automatic volume reduction during intense combat
3. **Improper Event Instance Cleanup** - Voices not being released properly
4. **CPU Pressure from Spatial Audio** - Resonance audio processing overhead
5. **Pool Size Limitations** - Object pool too small for audio components

## Enemy Behavior Indicator Issues

Potential causes for unclear enemy audio cues:

1. **Low Mix Volume** - Enemy sounds mixed too low in Master.bank
2. **Insufficient Spatial Positioning** - Sounds not directional enough
3. **Lack of State Variation** - Same sounds for all enemy states
4. **Audio Masking** - Other sounds drowning out enemy cues
5. **Missing Parameter Changes** - No FMOD parameter automation for enemy state