Unity Stop Event with Duration doesn't work

Question

Hi, I am not quite sure what/why causes that or what I am missing. In the script, I am trying to stopEvent with a duration and curveinterpolation, but, no matter what, it stops the event immediately.

AkSoundEngine.StopPlayingID(themeSongID,5,AkCurveInterpolation.AkCurveInterpolation_Linear);

themeSong.Stop(gameObject,5,AkCurveInterpolation.AkCurveInterpolation_Linear);

I tried both and result didn't change.
Also, I think it might be related, it's "Music Playlist Container" that I'm using. It's looping as well. If that causes that confusion, how can I solve this?