If you are using pipewire
add -sdlaudiodriver pipewire
to your CS 2 launch options.
For those using gamemoderun
it would look like this: gamemoderun %command% -sdlaudiodriver pipewire
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For flatpak steam, you need to run this:
flatpak override --user --filesystem=/run/user/1000/pipewire-0 com.valvesoftware.Steam
Then
-sdlaudiodriver pipewire
launch option will work.