Raspberry Pi B+ + Amp+ + MusicBox: aplay -l shows no soundcards

I have set up a Raspberry Pi B+ with an Amp+.
I loaded MusicBox (both 0.5.2 and 0.5.3) and followed the guide to update the kernel and setup the /etc/modules and /etc/asound.conf files.
But after doing this and rebooting aplay -l showed no soundcards.
I repeated this some times with always the same results.

Are there any tricks or checks in order to fix this issue?



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