On the same ROM. Don't know if I have any music loaded (I stream everything), but I'll give it a shot. Do you notice it with YouTube as well?
Okay, so on YouTube, it "does" this. Problem is, I'm feeling feedback in the back speaker from my finger so I don't know if it's playing on both and I'm just not noticing the earpiece or not. Can't imagine there's any ROM specific tweak involved. There's no proximity sensor.
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