Crappy Sound on Trixie but not on Bookworm

[john doe <johndoe65534@mail.com>]

Debians,

I just did a fresh install of Trixie, the sound is cracling, stuttering 
and choppy.
The desktop computer is connected via SPDIF to a soundbar.

In the logs I see:
gsd-media-keys[1906]: Unable to get default sink
gsd-media-keys[1906]: Unable to get default source

I don't think it's related but ..

[1 did not help at all and I don't have fluidsynth installed.

I was wondering if you have any ideas on what to do other than using 
Pulseaudio?

Any help is appreciated.

[1] https://wiki.debian.org/PipeWire#choppy_audio_on_systems_with_high_load

--
John Doe