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Hi,
After upgrade my phone, i can't hear songs volume is very very low.i increase volume level,but same sound only in
both headset & Phone.
Double check the volume under settings> sound.
Try to clear data for Walkman under settings > apps > all > Walkman > clear data. Restart the phone and try again.
You can also try to see if the same behavior appears if you start the phone in safe mode:
http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008#U348008
Perhaps you have some 3rd party apps installed in the phone causing the problem.