Headphone Line In to Dock Output

i’m looking app use headphone socket line in , output audio through dock @ bottom.

i’ve got dab radio in car fm transmitter shocking in area. i’ve got ipod connector in car can’t connect dab radio line out. thought if run audio headphone socket on iphone, know take audio in, , play through dock should work.

i’ve tried searching apps can’t word criteria right. know of solve this? or other creative solution?

in advance.

 

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