Can't find this in the manual anywhere: There are two levels (groups of six) of stations that you can preset. Is there an easy way to toggle between the two groups? At present I just hit the "XM" button twice but then I have to go to through the menu on the screen to the "Presets" group. A bit of a pain. On my G35 all I had to do was hit the "XM" button and the other group came up.