Procedural Sound Generation with NumPy/SciPy

Development

Generate sound effects for ZX games using Python synthesis. **Spec-Driven Workflow (RECOMMENDED):** 1. Create `.spec.py` in `.studio/specs/sounds/` 2. Run `python .studio/generate.py --only sounds` **Load references when:** - SFX specs → `references/sound-spec-format.md` - Example specs → `examples/laser.spec.py`, `examples/explosion.spec.py` - Recipes → `references/sfx-recipes/` - Manual synthesis → `references/numpy-scipy-building-blocks.md` - Quality standards → `references/quality-standards.md` **Before generating:** Check `.studio/sonic-identity.md` for audio specs.

QUICK START

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Procedural Sound Generation

Generate game sound effects using a spec-driven workflow.

pip install numpy scipy soundfile

Spec-Driven Workflow

Step 1: Create Spec

# .studio/specs/sounds/laser.spec.py
SOUND = {
    "sound": {
        "name": "laser",
        "duration": 0.25,
        "layers": [
            {"type": "fm_synth", "carrier_freq": 600, "mod_ratio": 1.5, "mod_index": 6.0},
            {"type": "noise_burst", "duration": 0.02, "amplitude": 0.3}
        ],
        "envelope": {"attack": 0.002, "decay": 0.15, "sustain": 0, "release": 0.08}
    }
}

Step 2: Run Generator

python .studio/generate.py --only sounds

See references/sound-spec-format.md for complete format.

ZX Audio Requirements

Spec	Value
Sample Rate	22050 Hz
Bit Depth	16-bit
Channels	Mono
Simultaneous	16 + 1 music

Quality Standards (Temp Tier)

Minimum requirements:

2-3 synthesis layers
Proper envelope (exp decay, NOT linear)
Filtering (lowpass sweep or static)
Richness (harmonics or detuning)
Normalization (0.9 peak)

Anti-patterns:

Simple sine + linear fade
Single oscillator, no filtering
Instant attack (clicks)

See references/quality-standards.md for complete checklist.

Technique Selection

Technique	Best For
Subtractive	Bass, warm, explosive
FM	Metallic, bells, digital
Additive	Organs, complex tones
Karplus-Strong	Plucked strings

Recipe Library

Sound Type	Recipe
Laser/Zap	`sfx-recipes/laser.py`
Explosion	`sfx-recipes/explosion.py`
Hit/Impact	`sfx-recipes/hit.py`
Coin/Pickup	`sfx-recipes/coin.py`
Jump	`sfx-recipes/jump.py`
UI Click	`sfx-recipes/ui-click.py`

Workflow: (1) Find closest recipe, (2) Read file, (3) Copy and customize.

nether.toml Integration

[[assets.sounds]]
id = "laser"
path = "generated/sounds/laser.wav"

let laser = rom_sound_str("laser");
play_sound(laser);

File Organization

.studio/specs/sounds/
├── laser.spec.py
└── explosion.spec.py

generated/sounds/
├── laser.wav
└── explosion.wav