Agent skill

sound-engineer

Use this skill when we need to generate sounds or run sound engineering

View SKILL.md on GitHub Repository
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Install this agent skill to your Project

npx add-skill https://github.com/majiayu000/claude-skill-registry/tree/main/skills/development/sound-engineer

SKILL.md

Sound Engineer Agent

You are a sound effects generation agent for a multiplayer racing game. Your job is to create audio files (.mp3 or .wav) for game sound effects using programmatic audio synthesis.

Environment Setup

Before generating sounds, ensure these Python packages are installed:

bash
pip install numpy scipy pydub

For MP3 export, also ensure ffmpeg is available:

bash
brew install ffmpeg  # macOS

Sound Generation Approach

Use Python with NumPy/SciPy for audio synthesis. The general pattern:

python
import numpy as np
from scipy.io import wavfile
from pydub import AudioSegment
import os

SAMPLE_RATE = 44100

def generate_sound(samples, filename):
    """Save samples to WAV, then convert to MP3"""
    # Normalize to 16-bit range
    samples = np.clip(samples, -1, 1)
    samples_16bit = (samples * 32767).astype(np.int16)

    wav_path = filename.replace('.mp3', '.wav')
    wavfile.write(wav_path, SAMPLE_RATE, samples_16bit)

    # Convert to MP3
    if filename.endswith('.mp3'):
        audio = AudioSegment.from_wav(wav_path)
        audio.export(filename, format='mp3')
        os.remove(wav_path)

Sounds to Generate

1. Engine Sounds

File: static/audio/sfx/engine_idle.mp3

  • Low frequency rumble (50-100 Hz)
  • Slight pitch variation for realism
  • Loopable (seamless start/end)
  • Duration: 2-3 seconds

File: static/audio/sfx/engine_rev.mp3

  • Higher frequency base (100-200 Hz)
  • Add harmonics for richness
  • Loopable for pitch-shifting in game
  • Duration: 2-3 seconds
python
def generate_engine_sound(base_freq=80, duration=2.0):
    t = np.linspace(0, duration, int(SAMPLE_RATE * duration))

    # Base frequency with slight wobble
    wobble = 1 + 0.02 * np.sin(2 * np.pi * 4 * t)

    # Multiple harmonics for engine character
    sound = 0.5 * np.sin(2 * np.pi * base_freq * wobble * t)
    sound += 0.3 * np.sin(2 * np.pi * base_freq * 2 * wobble * t)
    sound += 0.15 * np.sin(2 * np.pi * base_freq * 3 * wobble * t)

    # Add some noise for texture
    noise = np.random.uniform(-0.1, 0.1, len(t))
    sound += noise * 0.1

    # Fade ends for seamless looping
    fade_len = int(SAMPLE_RATE * 0.05)
    sound[:fade_len] *= np.linspace(0, 1, fade_len)
    sound[-fade_len:] *= np.linspace(1, 0, fade_len)

    return sound

2. Collision Sounds

File: static/audio/sfx/collision_soft.mp3

  • Short impact (0.2-0.3 seconds)
  • Low-mid frequency thump
  • Quick decay envelope

File: static/audio/sfx/collision_hard.mp3

  • Longer impact (0.4-0.6 seconds)
  • More noise component
  • Metallic overtones
python
def generate_collision(intensity='soft'):
    duration = 0.3 if intensity == 'soft' else 0.5
    t = np.linspace(0, duration, int(SAMPLE_RATE * duration))

    # Impact envelope (quick attack, decay)
    envelope = np.exp(-t * (20 if intensity == 'soft' else 12))

    # Low frequency thump
    thump = np.sin(2 * np.pi * 60 * t) * envelope

    # Noise burst for crash texture
    noise = np.random.uniform(-1, 1, len(t)) * envelope
    noise_filtered = noise * (0.3 if intensity == 'soft' else 0.5)

    # Metallic ring for hard collision
    if intensity == 'hard':
        ring = np.sin(2 * np.pi * 800 * t) * envelope * 0.2
        thump += ring

    sound = thump * 0.7 + noise_filtered * 0.3
    return sound

3. Tire Screech

File: static/audio/sfx/tire_screech.mp3

  • High frequency noise (filtered)
  • Duration: 1-2 seconds
  • Loopable for continuous drift
python
def generate_tire_screech(duration=1.5):
    t = np.linspace(0, duration, int(SAMPLE_RATE * duration))

    # Filtered noise for screech
    noise = np.random.uniform(-1, 1, len(t))

    # High-pass filter effect (simple differencing)
    screech = np.diff(noise, prepend=noise[0]) * 5

    # Add some pitch modulation
    mod = np.sin(2 * np.pi * 15 * t)
    pitch = 2000 + 500 * mod
    carrier = np.sin(2 * np.pi * np.cumsum(pitch / SAMPLE_RATE))

    sound = screech * 0.3 + carrier * 0.2

    # Envelope
    envelope = np.ones(len(t))
    fade = int(0.1 * SAMPLE_RATE)
    envelope[:fade] *= np.linspace(0, 1, fade)
    envelope[-fade:] *= np.linspace(1, 0, fade)

    return sound * envelope

4. UI Sounds

File: static/audio/sfx/player_join.mp3

  • Pleasant chime (0.3-0.5 seconds)
  • Rising pitch pattern

File: static/audio/sfx/button_click.mp3

  • Very short (0.1 seconds)
  • Clean click/pop
python
def generate_ui_chime():
    duration = 0.4
    t = np.linspace(0, duration, int(SAMPLE_RATE * duration))

    # Two-note rising chime
    freq1, freq2 = 523, 659  # C5, E5

    note1 = np.sin(2 * np.pi * freq1 * t[:len(t)//2])
    note2 = np.sin(2 * np.pi * freq2 * t[len(t)//2:])

    sound = np.concatenate([note1, note2])

    # Envelope
    envelope = np.exp(-t * 5)
    return sound * envelope * 0.5

def generate_button_click():
    duration = 0.08
    t = np.linspace(0, duration, int(SAMPLE_RATE * duration))

    # Quick pop
    freq = 1000
    sound = np.sin(2 * np.pi * freq * t)
    envelope = np.exp(-t * 50)

    return sound * envelope * 0.3

Output Directory

Place all generated sounds in: static/audio/sfx/

Quality Checklist

For each sound:

  • Normalized to prevent clipping
  • Appropriate duration for use case
  • If loopable, ensure seamless loop points
  • Export as MP3 at 128kbps or higher
  • Test playback in browser

Integration with AudioManager

After generating sounds, they need to be loaded in audioManager.js. Add them to the loadSounds() method:

javascript
const sfxSounds = {
    engine_idle: '/static/audio/sfx/engine_idle.mp3',
    engine_rev: '/static/audio/sfx/engine_rev.mp3',
    collision_soft: '/static/audio/sfx/collision_soft.mp3',
    collision_hard: '/static/audio/sfx/collision_hard.mp3',
    tire_screech: '/static/audio/sfx/tire_screech.mp3',
    player_join: '/static/audio/sfx/player_join.mp3',
    button_click: '/static/audio/sfx/button_click.mp3'
};

Dynamic Engine Sound System

For the in-game engine that changes with car speed, the audioManager needs:

  1. A looping engine sound source
  2. Real-time pitch control based on speed (0.8x to 1.5x playbackRate)
  3. Volume based on acceleration state

The host.js game loop should call:

javascript
audioManager.updateEngineSound(carSpeed, isAccelerating);

This requires implementing the engine sound methods in audioManager.js.

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