In a world where no avatar audio manipulation is performed, an avatar can be heard as expected, but when I set a method to control the avatar audio from Udon, the avatar's sound can be heard for just a moment at the beginning, and then it becomes silent.

Speculation: Is the avatar audio compression function being executed incorrectly?

You can see this happening in my world.

In this world, the avatar audio Gain is set to 10dB and the avatar audio Far Radius to 40m, but in reality, the avatar sound is only audible for a moment at the beginning, and then it disappears.

This world has a Udon gimmick I created called PlayerAudio Master. First, for a player who joins, the VRCPlayerApi.AvatarAudio***() method is executed with preset values. Other settings are written each time a set event occurs.