I had problems setting up mine but got it running eventually. Take a look at this thread.
for some reason the link won’t show, so work it out yourself!
As you can see, I missed the final essential bit which was selecting the correct driver in the audioplayer – Edit Advanced Settings – Soundcard.
I selected „default – snd_rpi_wsp, – Default Audio Device, CARD=sndrpiwsp“ and suddenly it worked!