The tool - AdjustVolumeUseHeadSet for RN2M and RN6

You can use this tool if you buy that PND - RN2M, RN6

That tool will volume down the level 1,2, 3, not change others when you want to listen the music with headset more comfortable.

It can be used to "Gosget Go-568","NavRoad NR460","NavRoad NR560"

Download link:
AdjustVolumeUseHeadSet.zip