AEC reference repro: RTCPeerConnection teardown before call

Trigger = short-lived probe RTCPeerConnection objects are released (and GC'd) after the mic opens, before the call. Control = identical, but one RTCPeerConnection object is kept alive throughout.

1. Devices

Asks for mic permission once (the temporary track is stopped immediately).

Mic

Speaker

2. Mode & prepare

Trigger Control (keep-alive RTCPeerConnection)

Probe RTCPeerConnection objects Wait after release (s)

Reload the page before each run / mode switch.

3. Call

Loopback pc1 → pc2 sends female_voice.wav; the remote <audio> plays it with setSinkId(speaker).

4. Record mic

Playback uses the system default output.