am b0374a0e: Merge "Several improvements in audio effects volume control." into gingerbread

Merge commit 'b0374a0e22756d956f8ebf2b19b1139e9e5e3384' into gingerbread-plus-aosp

* commit 'b0374a0e22756d956f8ebf2b19b1139e9e5e3384':
  Several improvements in audio effects volume control.