SUMMARY This command doesn't work with pipewire: pactl load-module module-loopback but module loopback is now implemented in pipewire master: https://gitlab.freedesktop.org/pipewire/pipewire/-/issues/970#note_864047 I want to hear everything that is connected to line-in or mic. Regular users need visual / GUI switch in plasma-pa, so that they don't need to search for proper command on the Internet and paste to terminal or dig into alsa settings. It should be in system sound settings. This feature is essential for users who want to record their voice from microphone or similar sources, like people who record podcasts, record video courses with audio comments, streamers, etc. Mobile phone may act as a microphone when attached to line-in (with proper software of course).
I would very much like to have a speaker/echo test thing. It's on my todo-list, but I can't promise to get to it anytime soon