That's a pity!
I'm currently running the latest binaries from the website, installed for the local user with
I'm running Debian bookworm, but I don't have Debian's build of Calibre installed, instead I only have the binaries from the website.
As I have mentioned before, I do hear audio for the TTS Read Aloud, so audio is partially working. Just not when it should be playing back the embedded audio files.
I'm willing to go to considerable lengths to investigate, when provided with some instructions.