Audi Concert Bose Head Unit Replacement

Hi I hope someone can help me please !

I have the above unit and as you might have guessed the volume is knackered !

I would like to fit an aftermarket one in but will i still be able to use the bose amp and will the details like CD changer track still show on my dashboard.

I have 2001 TT

Also does anybody have and suggestions of any aftermaet one which will fit in no prob's.

Also if i was to keep the existing one is there any way of intergrating it with my iphone ?:1zhelp::1zhelp::1zhelp::1zhelp::1zhelp::1zhelp:

Look on here for posts by Froggy, his Co. can repair the volume problem.
No idea about the i-phone.

i have the alpine ida x100 and its ipoc based.

works with bose etc but not sure about the dis