It is not advisable to run mpd as root. Therefore,
in /etc/mpd.conf the user "mpd" should be chosen.
However, for starting mpd as a service and have access
to the audio devices, it is necessary to create a group
"audio", and add the mpd user to it. 

Unfortunately, Fedora < 12 does not have a group "audio". 
Using the group "audio" allows any of its members to
login in a console, and have access to the audio devices.

-----------------------------------------------------------

How to add the audio group in Fedora < 12 and RHEL5.

1) Change /etc/security/console.perms.d/50-default.perms
# <console>  0600 <sound>      0600 root
<console>  0660 <sound>      0660 root.audio

2) Create a file /etc/udev/rules.d/52-sound.rules with the following
contents:
# audio devices
KERNEL=="dsp*",                 GROUP="audio", Mode="0660"
KERNEL=="audio*",               GROUP="audio", Mode="0660"
KERNEL=="midi*",                GROUP="audio", Mode="0660"
KERNEL=="mixer*",               GROUP="audio", Mode="0660"
KERNEL=="sequencer*",           GROUP="audio", Mode="0660"
KERNEL=="sound/*",              GROUP="audio", Mode="0660"
KERNEL=="snd/*",                GROUP="audio", Mode="0660"
KERNEL=="beep",                 GROUP="audio", Mode="0660"
KERNEL=="admm*",                GROUP="audio", Mode="0660"
KERNEL=="adsp*",                GROUP="audio", Mode="0660"
KERNEL=="aload*",               GROUP="audio", Mode="0660"
KERNEL=="amidi*",               GROUP="audio", Mode="0660"
KERNEL=="dmfm*",                GROUP="audio", Mode="0660"
KERNEL=="dmmidi*",              GROUP="audio", Mode="0660"
KERNEL=="sndstat",              GROUP="audio", Mode="0660"

3) Create a group "audio" and add all users allowed to access 
the audio devices.

/Paulo Roma
