I wonder if anyone here is having this issues but I found one quite annoying bug. Hope it is just software..

I usually used a IEM earphone (isolation earphone) with mic and I notice there is really obvious sound feedback from the environment around me, as if the noise cancellation mic is still active and replaying back the sound back in earphone.

Problem is, the earphone is already isolated so the inverted sound from outside which is supposed to cancel off environment sound is not working as it supposed to. Thus you only hear the environment sound in your earphone.

I saw this is an issues with others in Apple forum too, http://discussions.apple.com/thread.jspa?t...tart=0&tstart=0

Here hoping Apple will be doing the right thing and fix this in 4.2.