Bug#427903: change default driver in /etc/libao.conf

[Clint Adams]

> Change the default driver to alsa in the file /etc/libao.conf after 
> upgrading to this version.

Are you referring to this change?

|  * Change default device from 'oss' to 'alsa09' in /etc/libao.conf. With the
|    availability of dmix, this should mean that more users get it working out
|    of the box, even if they have a sound daemon running. (Closes: #304421)

If so, what is the problem?