Airplay with model B DAC

Hi everyone,
i recently received a DAC for my model B and I'm trying to make it work as an Airplay speaker using this tutorial:

To update my system with the new hardware, I followed the tutorial about kernel update, remove black listings etc...
But no sound exits from the DAC.
If I use the built-in hearphones jack everything is ok...
I'm a newbye about linux and hardware in general, so I don't know what to do!!!

Just one doubt:
once I create the file described at the point
"Configure ALSA"

do I have to modify somehow the file permissions?

Please help!
Thank you very much.


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