I was experimenting with slow mode (80% of velocity of time normal) but record without audio, after record to 100% and have audio, then i try newly at 80% slow and havent audio. This is normal?
They can't record audio properly in this modes. Because for encoder it is still 24p :-) So, in 30p you'll have audio stuttering (I tried after enabling audio stream) I low fps modes you'll just have hanging camera because of audio buffer overrun.