Previously I had only ALSA. The output was directed both to monitor
(headphones) and speakers (line out). So I could for example switched off
speakers and listen on monitor or headphones. When I wanted more power, I
switched on speakers.

Currently I use ALSA with pulseaudio plugins (it was in a way requested on this
site that I do this) and this no longer works. Not only I have to switch on/off
speakers, but each time I have to change the selection in pavucontrol (this was
suggested as well).

This is very annoying and waste of time. It is another regression in UX with OS
13.2.