I believe I have installed everthing correctly.
I have:
registered at the Syrinscape.com
a Syrinscape Banner in Fantasy Grounds Unity
entered a authentication code
started the Syrinscape Online Player
connected the Online Player (entered the PIN Code, connected 24 min now)
installed Syrinscape Fantasy Player and tested it (it works)
restarted FGU
When I choose a sound in the Syrinscape Sound Windows (in FGU) I get a window with play/stop buttons. No sounds is heard when clicking play.
Might I have missed something?