Seems like a stupid question but here goes:

 

I use a MSFRD-1 to interface my z140bh with my ford sync in my 2011 f-150. I use my trucks bluetooth for phonecalls since it is much faster and better than the avic. To use my sync with bluetooth audio, I have to switch to my radio's aux port, but for the life of me I can't find this setting in my avic menu!! Anyone?