I'm on Debian/sid too.
An issue in libasound2 and libglibmm-2.4-1v5. You want to revert:
libasound2, libasound2-data to 1.1.6-1
libasound2-plugins to 1.1.6-1+b1
libglibmm-2.4-1v5 to 2.56.0-2
And the sound is back.
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gpg --keyserver keys.gnupg.net --recv-key F949BD3B