radio - bad reception even with a in line amp
cd - wont play when hot
nav- works most of the time but if i want to use my snooper it wont work
multi changer - dont work
ipod - the front lead is rubbish and the rear lead is not to be found
With regards to the radio reception - Have you fitted a double fakra convertor lead?
Also try a different Ipod lead i think the supplied ones a a bit 'pony' to say the least.
Think the multi changer issue is very hit and miss from what i've read too.
Is your unit a Mk4 (with rear USB)?
Luckily i'm just wanting to hook up a USB source and not to worried about CD's