I have a guilty conscience. I didn't work the last few days on it.
It works but there are so many tiny things to fix.
First was that the player should not play in the background. I think if the browser is not in focus the player shouldn't play.
Now I have to look that all parameters are saved if someone make a save state. It won't possible to play the song form the last position were it was saved. The player-engine doesn't support that. It will play the song from the beginning.
At the moment you can set the volume, reverb, loop, look if a song is played, length of the song, look the playing position and play, stop, pause the song and start over from the beginning.
At the moment I have to fix all the descriptions and labels for the condition, actions and expressions to more meaningful.
I hope it will be all done shortly