Noticed in iOS7 when playing a song through iphone external speaker it is not playing in stereo, I can def hear missing guitar parts to songs etc. Anyone notice this or is there a fix?
Check under Settings -> General -> Accessibility -> Mono Audio
I think OP is suggesting that the loud speaker is playing just one of the stereo channels instead of mixing left and right.
I'm not sure if this is true, but I wouldn't be surprised to see that kind of error in the Beta.