How to use RIN+/- LIN+/- for audio input

#1

ok, so I get RIN/LIN are left and right audio input,
DC coupled, so running 0..3.3v, with zero at 1.65v (CM) - correct?

but what do I connect +/- to ...
e.g. for left audio in, what do I connect to LIN- and LIN+

circuits, I've seen here talk about connecting to LIN-, but I don't see mention ofLIN+

separate question :
if I connect to RTS (audio in and out) do I have to disconnect connect the jacks? or if I ensure they are not used (e.g. they are in a box so not accessible at same time as the RTS inputs/outputs) is this ok.

#2

ok, so ive check the codec specs , LIN-, LIN+ , I assume are LINN andLINP ?

on p28, it implies i just attach to the inverting inputs e.g. LINN , and then bias via CM
correct? if so which is the best 3.3v to use for the opamp feeding into LINN/RINN.? VDDA? or VDDC?(which is used for codec)

@johannes do we have access to LAUX, RAUX, also is there a way to pickup the LOUTP ROUTP directly?