I have a Zumo 350LM connected to my Helmet with a Sena 10R unit
My problem is that the volume output of the GPS is much louder than the one from my phone.
So when the volume is right for my GPS my phone is barely audible and when the volume is right for my phone the volume from the GPS is painfully loud.
Is there anyway to lower the output volume from the GPS itself when it transmits via bluetooth?