I think I'm going to abandon the RN-52 and try that BlueGiga WT32i module. I've ordered one of those fancy reference kits with all the RCA plugs.

I figure that the RN-52 seems to have had only one firmware release of the "Source" mode firmware, and that firmware is really half baked. Their gain control command doesn't do anything. Also I noticed that the command reference has no way of entering track metadata at runtime in source mode, so I wouldn't ever get to have track data in there.

So I think I have a better bet with that BlueGiga module since clearly their refernce kit has RCA inputs and it's intended to be a high quality audio interface.
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Tony Fabris