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yes to add to dans post,
did you try another cable?
what mp3 player app were you using? did you make sure the players L/R balance controls were set to null (in the middle) for both track to play?
has this happened everything you plugged the handset in?
did you plug in headphones to see if you got the same issue?
I tried iHeartRadio and TuneInRadio and played some music with the player that comes on the EVO. The icon that showed up when I plugged it in was of a headset with microphone instead of the headphones only icon. When I plugged in some headphones, the headphones only icon did show up.
true there are not balance controls on the stock player but on some other players there are. i was only covering bases.. ;-)
to the OP, sounds like the patch cord you are using is confusing the handset into thinking its a earphone and mic set. i would try another patch cable.
and when you tried the headphones and the headphones onlly icon showed, did you listen to the phones and see if you hear thru both earcups?