Hi Ingmar, glad you got the next issue sorted.
It’s always frustrating when you find a bug that is part of the backlog.
(I found a metaball bug yesterday which had me scratching my head, only to research and find out it was a ‘known issue’)
Here are my sound Settings (I’m on Linux these days – I think the lip sync course was recorded on Mac)

Pulse Audio was just the default audio device.
Is it the best? Dunno, it works fine so I haven’t had to mess with anything.