Orange,

Thanks for the suggestion, turns out it was a bad DSP.

I received a replacement DSP but did not even try it, since everyone including Dice, kept telling me I should not need the DSP module for my year and model X5. (2006 X5 4.4 sport with business CD)

On a whim, before sending everything back, I hooked up the new DSP and bam! AUDIO.

So I am now happy.