Hello there.
Looks like after the last update the problem with the sync in multitrack audio songs is resolved. My backing tracks ( all of them 48khz ) now playing synchronized ( after choosing the right audio resolution in ‘playback settings’)

Fantastic news. It seems that any kind of sample rate conversion messes up the timing of multiple audio players.

Now we need to observe if sample rate conversions on the output (if an interface does not support the selected internal sample rate) also messes up the sync.