Hi, thanks for your advice.
When I stop the other services specifically snapcast-server and/or snapcast-client the audio goes completely off. When I turn snapcast-server off Bluetooth is turned off for a second and goes back on. Then when I connect my device I have no audio and alsamixer is still at 100 after connection. As soon as I turn snapcast-server back on, audio comes back and alsamixer level goes down to 36. You migth be in the right track though. Any clue what to do next?