Comment 7 for bug 1182862

First the warning, you will install work in progress software so it will maybe break your system.
But it should work fine.

// to install the new panel and indicators
sudo add-apt-repository ppa:elementary-os/staging
sudo apt-get update
sudo apt-get install wingpanel
killall wingpanel (maybe a restart)

*Test with your sound device*

// to revert to the old wingpanel and indicators
sudo add-apt-repository --remove ppa:elementary-os/staging
(or ppa-purge if you want get rid of everything installed above http://askubuntu.com/questions/307/how-can-ppas-be-removed )
sudo apt-get update
sudo apt-get install wingpanel=0.3.0.1* --reinstall
killall wingpanel