In the Multimediasettingsof KDE you can see that the soundblaster card is greyed out - why? This is the card that is working in ALSA, but only sometimes with pulseaudio in KDE.
I tried to create an installation of Debian Bullseye, but this is not possible too ... https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=972820
