Many people reccomend uninstalling pulseaudio, because it sometimes interferes with ALSA. I've had (and continue to have) issues with sound myself. I can't get it out of some applications (like dosbox), but then others play audio just fine.
You can try removing pulse audio from the command line like this: sudo apt-get remove pulseaudio
It is case sensitive so make sure I have pulseaudio spelt right if it dosn't work off the bat. In the case that it turns out you need pulse audio re-installing is simple: sudo apt-get install pulseaudio
Sometimes you will have to do and update and upgrade to apt-get first. Other than that I don't know what to reccomend because I pass audio through the HDMI on my setup.