Hard to point out what is happening... But I think too pulseaudio will help. As Aere told you it's a good idea install pavucontrol and pulseaudio packages. Just make sure to install both because as far as I remember the packages are not connected on 13.04.
The missing volume control happen to me when I had compatibility issues with the kernel and my Nvidia card. For a complete analysis could you gently reply to some questions too? Did you try to set audio with alsamixer via terminal to set if audio output is muted? Are you using Ati closed drives? Are you trying to use HDMI audio? F.
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