I am having a similar issue. I have 2006 X5 4.4 with analog DSP. Second car I have installed Dice into.

I have tried two Dice Silverlines, one from EAS and one RMA'd from Dice, neither will provide sound. I have all the controls and info displayed on the dash. I can select TRK 1-6 and get info such software version, albums, playlist, etc. all controls on steering work, everythings ok, just no sound.

I also have XM Direct with blitzsafe adapter, but I have taken this out of the loop and still no sound. At a loss, looking to return everything.