@Lunz, maybe it will help the site of Mr. Correderajorge
http://www.correderajorge.es/bluetooth-on-raspberry-audio-streaming/
In the meantime, the bluetooth experiment will be finished 100%.
So, we can handle Musixbox normally and complete with all futures and the output will be transmit (stereo) with a good quality to the (my) bluetooth sounbar.
In the weekend I’ll publish a howto in this topic.