So, after the next testings, there is still a bit to be done with the queue function: It does not automatically plays the next song in the playlist, sometimes yes, and sometimes you have to click on the "play now" menu to have it play the next item.
Anyway, it's already my favorite music app, great output quality, very stable and you can multi-task something else while listening.
One future enhancement would be the ability to loop the playlist when it reaches the last song (replay it all)
Thanks