https://docs.vrchat.com/v2019.2.5/docs/vrc_playeraudiooverride documents an avatar gain limit of -80 as being silent, but when I tested I was able to hear my own avatar (albeit very faintly).
https://docs.vrchat.com/v2019.2.5/docs/vrc_playeraudiooverride によると、avatar gain limitが-80で無音になるはずが、実際は自分のアバターをかすかに聞こえた。
And a pre-beta private avatar: https://www.vrchat.net/home/avatar/avtr_1a3eeaa8-0f7f-4863-91ed-5600fc1e054b (sound enabled by activating the emote switch and using a fingerpoint gesture)