PulseAudio – modules

pactl load-module module-loopback latency_msec=1

pactl unload-module module-loopback

• How to hear my voice in speakers with a mic?
  https://askubuntu.com/questions/123798/how-to-hear-my-voice-in-speakers-with-a-mic

pactl load-module module-echo-cancel aec_method=webrtc source_name=echocancel sink_name=echocancel1

pactl unload-module module-echo-cancel

• How To Enable Echo / Noise Cancellation Of Microphone Input On Your Linux Desktop (PulseAudio)
  https://www.linuxuprising.com/2020/09/how-to-enable-echo-noise-cancellation.html