mcpbeat

Xb Sound

google/xb-sound

>- Play and capture audio in an XR Blocks app via `xb.sound` — spatial (positional) audio anchored to scene objects, master volume control, microphone recording and playback, plus speech recognition and synthesis. Use to add sound effects, 3D-positioned audio, voice recording, or text-to-speech / speech-to-text. Covers `xb.core.sound` (`startRecording`/`stopRecording`/`playRecordedAudio`, `getAudioListener`, `setMasterVolume`) and the exported `SpeechRecognizer` / `SpeechSynthesizer` / `SoundSynthesizer` classes. See samples/sound.

574 tokens
context cost
the whole folder, loaded on every use
1
files
instructions only
0
copies elsewhere
how many repositories repackaged it
455
stars on the repo
on the repository, not the skill itself

Install

one command, takes just this skill from the repository 
npx skills add https://github.com/google/xrblocks --skill xb-sound

The instruction itself

5 sections, as written by the author

xb-sound: spatial audio & speech

xb.sound (a.k.a. xb.core.sound) manages audio. See samples/sound, demos/sound_detector,

and src/sound/ (which has its own README).

Spatial (positional) audio

Attach a THREE.PositionalAudio to any object so it pans/attenuates with the listener:

const listener = xb.core.sound.getAudioListener();
const audio = new THREE.PositionalAudio(listener);
audio.setBuffer(audioBuffer); // a decoded AudioBuffer
audio.setRefDistance(0.5);
audio.setVolume(1.0);
ball.add(audio); // parented to the object → 3D positioned
audio.play();

Microphone recording & playback

await xb.core.sound.startRecording();
// …later…
const pcm = xb.core.sound.stopRecording(); // ArrayBuffer of Int16 PCM
const rate = xb.core.sound.getRecordingSampleRate();
await xb.core.sound.playRecordedAudio(pcm, rate);
xb.core.sound.setMasterVolume(0.8); // 0..1

Speech recognition & synthesis

The SDK exports xb.SpeechRecognizer and xb.SpeechSynthesizer (plus xb.SoundSynthesizer

and xb.BackgroundMusic). Use them for speech-to-text and text-to-speech; see

src/sound/SpeechRecognizer.ts and

src/sound/SpeechSynthesizer.ts for their APIs.

Notes

  • Microphone access prompts for permission; set options.permissions.microphone = true (or

use a feature that requests it) before relying on recording.

  • Recorded data is Int16 PCM; convert to a THREE AudioBuffer for positional playback

(see the conversion in samples/sound/main.js).

  • Call xb.core.sound.disableAudio() to tear down capture when done.

How to use it

Copy the folder

Take google/xb-sound from the repository into ~/.claude/skills for personal use, or into .claude/skills inside a project.

Check the name does not clash

The agent identifies a skill by the name field in its header. Two skills with the same name cannot sit side by side — one of them will be ignored.