OK. I didn't read the original post thoroughly.

Version 1.1 has support for the cellphone mute line. In response to the cellphone mute, you can configure it to do one of the following:

1. Mute playback
2. Pause playback
3. Attenuate (turn the volume down).

You might be able to find a way to hack the nav system into the cellphone mute line, and then set it to attenuate.



Roger - not necessarily speaking for empeg