Echo feedback from commodity earbuds

[mwfarb]

Describe the bug

• Some computers in particular handle ARENA audio poorly, and send echo feedback to all participants.
• Mike, Nitin, Anthony each have one of the echoing computers which create the condition.
• Root cause unknown.

To Reproduce Steps to reproduce the behavior:

1. Open any arena scene, microphone on.
2. Have other user connected with an echoing computer with standard earbud headphones, microphone on.
3. When you talk, you will hear your own voice echoed back.

Expected behavior No echo should occur.

[mwfarb]

What we know, on the echoing computers:

• ARENA web client: Standard/Android earbuds do produce the echo to others.
• ARENA web client: Apple earbuds do not produce the echo to others.
• Jitsi Meet web client: all earbuds do not produce the echo to others.