I have the NAV & TV, no DSP - all seems to be working ok other than the sound - just get a faint noise when I turn the volume up to max, thats on the Ipod.
Sound and all else ok for radio, Nav & TV.

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X5 4.4i 2006 sports package, Titanium silver, Sports exhaust with Xpipe, Limo tint, 20" wheels 168's (Black), 25mm H&R wheel spacers& arch flares all round - Loud........

Work in progress -:
Replace BMW Ipod system with DICE - installed but no sound yet??