Hello,

my F500 (combined with the ND-G500) mutes my stock radio when

- playing music from SD or USB

- playing video

- GPS gives voice output

- using hands free

Any possibility how to set up or mod the unit that it mutes my stock radio only when

- GPS gives voice output

- using hands free

I want to give the audio out parallel to the AUX IN of my stock radio to listen the music (but only the music) from the F500 via the Amp of my stock radio.

Any idea?

Does that mean you will not be using gps or handsfree with the avic while using it to play audio or video? Add a bypass switch to the mute wire, which leaves it disconnected when you choose to. When its disconnected, the amp passes the stock audio to the speakers.