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Grok Bot+18 agentsSFX Brew: Game Sound Effects
Add free, commercially usable sound effects to any game straight from your coding agent.
Free
SFX Brew: Game Sound Effects
Example session with this skill installed
I need three variations of a laser blaster sound for my space shooter. Save them as WAV files in assets/sfx/ and give me the seeds so I can regenerate them later.
- Read your context and instructions
- Compiled the sfx brew
Summary
Generated three laser blaster variations with the SFX Brew laser preset and saved them as 16-bit mono 44.1 kHz WAV files in assets/sfx/. Output below is from a real run of npx sfxbrew laser --count 3 --out assets/sfx/laser.wav.
Generated sound effects
| File | Seed | Length | Character |
|---|---|---|---|
assets/sfx/laser-01.wav | 158142834 | 1.31 s | falling zap, 2.6 kHz to 310 Hz in 0.15 s, short echo |
assets/sfx/laser-02.wav | 59806153 | 1.35 s | snappiest of the three, 2.8 kHz to 190 Hz in 0.09 s |
assets/sfx/laser-03.wav | 110420493 | 1.30 s | brightest start, 3.2 kHz to 260 Hz in 0.13 s |
Lengths include the echo tail; the zap itself is about 0.2 s.
Regenerate or tweak later
npx sfxbrew laser --seed 158142834 --out assets/sfx/laser-01.wav
The same seed always produces the identical file.
Play them in the game (browser example)
const shots = ['laser-01', 'laser-02', 'laser-03'].map(n => new Audio(`assets/sfx/${n}.wav`));
function playShot() {
const a = shots[Math.floor(Math.random() * shots.length)].cloneNode();
a.playbackRate = 0.95 + Math.random() * 0.1;
a.play();
}
Next steps
- Listen to the three files and keep the one or two you like, or keep all three and rotate them so rapid fire doesn't sound repetitive.
- For a retro 8-bit feel, I can re-render with
crush: 6; for a heavier plasma cannon, a lower start pitch and a longer slide. - Hook
playShot()into the fire action.
Connects securely to your tools. The creator never sees your data.
About this skill
Finding high-quality, royalty-free sound effects for games usually involves scouring stock libraries or paying for packs that don't quite fit. This skill generates synthesized SFX locally, delivering either WAV files or dependency-free JavaScript code directly into your project.
What it does
- Procedural generation creates unique variations of 29 presets including coins, explosions, and UI clicks.
- WAV export writes audio files directly to your project folders for engines like Godot, Unity, or Pygame.
- Zero-dependency JS produces standalone code snippets for browser games that synthesize sounds at runtime, with no audio files for most presets.
- Variation control generates multiple seeds for the same action to prevent repetitive "machine gun" audio patterns.
- Patch editing allows fine-tuning of frequency, decay, reverb, and bit-crushing via JSON parameters.
How it works
- Analyze project needs by scanning code for player actions and feedback triggers that require audio.
- Select presets from categories like UI, Action, Eastern Fantasy, or Instruments.
- Generate assets using the CLI or MCP tools to produce
.wavfiles or inline JavaScript. - Wire audio triggers into the application logic, such as calling a play function on a collision event.
Frameworks & tools
Works with any engine that can play WAV files (Godot, Unity, Phaser, Pygame and others) and with browser games through the dependency-free JavaScript export. Uses the open-source, MIT-licensed SFX Brew engine (sfxbrew.com).
Why this beats prompting it yourself
Generic LLMs cannot produce audio files or the specific math-heavy DSP code required for sound synthesis. This skill bridges the gap by interfacing with a local synthesis engine to provide tangible, commercial-ready assets instead of just descriptions of sounds.
Use cases
- Add retro jump and coin sounds to a React-based platformer.
- Generate five variations of a sword slash to cycle through during combat.
- Replace placeholder beeps with consistent, professional UI feedback sounds.
- Embed audio directly into a single-file HTML demo using generated JS snippets.
Known limitations
Initial setup requires a one-time download of the sfxbrew npm package (about 1 MB, recordings included). Four presets (war drum, lightning, gong, erhu) are built on short CC0 recordings: their WAV export works offline, but their JavaScript export loads small MP3s from sfxbrew.com on first play unless you self-host them.
Requires one-time npm package download. Four specific presets require external MP3 samples for JS exports unless self-hosted. Browser audio requires user interaction before playback.
How to use
- 1
Connect your agent to the Agensi MCP
Copy the prompt and paste it into Claude, ChatGPT, Cursor or any agent that supports MCP. It sets up the connection for you. Manual setup
- 2
Sign in to Agensi
Your agent shows a sign-in link. Sign in and click Allow.
- 3
Ask for what you need
Your agent loads this skill and uses it on your task. It always asks before any payment.
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Requires
Node.js