Interferance on my Concert radio when in CD mode

[VAGMAN1]

As above, when I change the volume whilst using CD mode, or change from CD to Radio mode, you can hear 'blips'

only does it when in CD mode!

other odd thing is that you can turn the up the volume louder when using radio, compared to when using CD's - at a ceratin point the sounds just distorts

btw, using a Sony changer, linked up via a Soundlinx interface (brand new) with the usual black/red/white plugs/leads

any suggestions....?

 

[AndyMac]

Yes, it'll be the non OEM changer & the interface. I had the same issues when I installed a Panasonic in my mates A3. Used the correct adapter but could not get rid of very slight engine whine only when in CD mode.
We ended up burning a CD with silence on it so we could play that really loud while trying different earthing points on botht the HU and the changer. In the end I had to resort to completely rewiring the changer directly onto the circuit board inside the HU as the plug Audi use has the lo level audio input from the changer completely unscreened.
I'd swap it over for a stock Audi changer - plenty on ebay for around £75.