If your technical problems is the playback of a single layer with frame rate of 23.98 with audio--
you dont set the playback rate to match the movie- because it then doesnt match the screen refresh rate - which is the most important thing of all - if preserving visual integrity is the ultimate goal-
when using audio everything is non-synchronised between screens and movie-
the best thing to try to do is set the playrate to the full screen rate
try screen 1/2 div 1 or 2- approx 60Hz or 75Hz
- if and only if your system can handle it -
this speeds up the processing of all video in the system to 60 or 75Hz - and will not work if you have lots of layers-
there is a very complex technical reason to do with asynchronous frame processing - why this is the best solution- with audio-