I have a NAV IV integrated into my '12 RT with audio system. When using the navigation and there is a voice command, the volume of the music cuts out as it should, but the volume of the Garmin voice is about 30% to 40% lower than the volume of what I had the music set at. I can hear it, but it's odd that the voice commands would be a different volume. The NAV IV volume is set to 100% for both voice commands and master volume. Is anyone else experiencing this and is there a fix? Thanks.