I installed a Gateway 100 today and to get it to 'normal' listening volume I have to turn the radio up to 30 - where usually around 10 is fine on the radio and CD settings. Is anyone else experiencing this? Have I overlooked some setting somewhere?

Having fitted the Dension Gateway 300 to my Civic EX I now find that the satnav announcements don't play unless I have the stereo on. I can have the stereo volume at 0 & the announcements play fine so not a MAJOR issue, but I am wondering why the announcements don't play at all with the stereo...