Hi all... I tested out the Sat Nav on my C220 yesterday for the first time. I found it to be really quiet, and with the radio on at a reasonable volume I cannot really hear the commands. I cant find anywhere to adjust satnav volume - can anyone tell me where I might find such settings? Also, shouldn't it dim the audio source (radio/cd/mem card/ipod/aux etc...) whilst it gives you instructions, like a TomTom with a docking kit does? I have the HDD Navigation if that makes any difference? I just want to be sure before going to my MB dealer and moan about this... Thanks in advance!