llSetSoundRadius(float radius)

Establishes a hard cut-off radius for audibility of scripted sounds (both attached and triggered).

Doesn't seem to do anything. It's not officially documented either, but the compiler eats it and there's a tooltip for it.

For now, limit the audibility of scripted sounds by using llTriggerSoundLimited or the normal sound playback functions with exceedingly low volume settings (e.g.: 0.05). You can also limit sound to the land parcel by enabling the appropriate option in the land settings dialog.

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Functions | Sound