I don't know of any buttons that will do exactly what you want, but if you press and hold for about a second the SCAN button on the right side of the NAV display, it will go to the next preset station and start scanning the preset stations (every 5 seconds or so). You cancel it by briefly pressing the SCAN button again. It won't scan in reverse and it scans both FM1 and FM2 presets as one big group.