Hi, just needed to thank you for reporting this: I just upgraded my system to Buster (as it is freezed, I hoped for the best) and the only sound output in KDE system manager was 'dummy', no audio output. Removing timidity got audio back working.
Now I'm not able to change audio output through system tray icon or even system manager: changing audio configuration is possible only through Pavucontrol. Definitely an annoying bug! Kind regards Marco
