To check on the version of Alsa installed type,
cat /proc/asound/version
Maintenance procedures if any sound problems,
Your user needs to be added to the sound group.
sudo usermod -a -G audio user
To set the required sound levels, enter the sound mixer.
sudo alsamixer
Use the up and down keys and set the volumes to the level that is required. Press the right key and press M on any that need to be un-muted.
Press ESC to quit out of the mixer.
To make alsa save the volumes run.
sudo alsactl store 0
MythTV
Access Utilities/Setup > Setup > General > Audio System > Audio Mixer to make changes,
