No, I haven't touched it, bought it this way. I thought the speakers were piss poor, so I installed BavSound, only to realize it was my radio reception. Not that BavSound wasn't a fantastic upgrade, but I may have been happy with the stock speakers.Sounds like the AGC (automatic gain control) that switches between the two is off. But in this tech, that is all processor controlled and not manually controllable with a poti, like older descretic component electronic tech.
I cant recall, did you change the ccc unit? Fairly sure that has some of the tuner components and possibly the gain control.
Anyway I digress. I'm not a radio guy, but I am a uP/firmware guy, so I can maybe keep up a little. Have you heard of the AGC going out on these before?