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Surface Explorer 4D features a dedicated audio engine that supports both physical audio tracks and procedural synthesizers, allowing you to combine breathtaking visuals with dynamic soundscapes.

The library recognizes two types of audio elements within the Sounds tab:

• Physical Audio (Music): standard .mp3, .wav and .ogg files.
• Procedural Audio (Synth): .json files containing mathematical formulas or script code designed to generate sound waves dynamically using the internal synthesizer.

Audio tracks and synths are directly integrated into your visual scripts. To apply a sound to your current visual creation:

1. Open the Sounds tab in the Library panel.
2. Single-click any audio file or procedural preset in the tree.
3. Its directive is added to the current script and the sound starts playing.
4. To remove the sound, single-click the highlighted file again: it stops and is no longer part of the scene, so a record saved afterwards has no sound. Click it once more to load it again and play it from the start.

To pause a sound without removing it, use the Stop Sound button of the Script dock. When you save a record or a scene with a stopped sound, you are asked whether to keep it.

In a scene, each object has its own sound, and all of them play together. The Sounds tab highlights the sound of the selected object, and the Run/Stop Sound button and the Library clicks act on that object only; the master START/STOP controls all of them. A scene file stores the sound of the environment and of every object, and a video of the scene mixes them all.

Behind the scenes, clicking an item injects one of these special directives into your code:

• //MUSIC: path/to/file.mp3 - Tells the media player to stream the background music track.
• //SYNTH: formula - Feeds the mathematical formula to the internal synthesizer to generate procedural sounds.

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