Audi A4 Audio & misc

[Byas U Nambisan <Byas_U_Nambisan@ccm.fm.intel.com>]

I would like to fit a CD changer on my Audi A4 to play through the Delta head 
unit. The price on the Factory unit is too high (~$700-900).  I was hoping that 
I would be able to get something that could plug right in.

Has anyone else done this?  Who manufactures the original CD player?  Blaupunkt?
I tried Crutchfield, but they could not help me.  They said that Blaupunkt used 
3-4 different command protocols, and so I would have to get the right match.

Would appreciate any info.

Thanks,
Byas