I now removed the pulseaudio and install alsa. I have followed this guide:
http://linuxg.net/how-to-properly-replace-pulseaudio-with-alsa-on-crunchbag-linux-and-debian-squeeze/
hannah@tx3:~$ sudo apt-get install alsa-base alsa-tools alsa-tools-gui alsa-utils alsa-oss alsamixergui libalsaplayer0
Reading package lists... Done
Building dependency tree
Reading state information... Done
alsa-utils is already the newest version (1.2.2-1ubuntu2).
The following additional packages will be installed:
libfltk1.1 linux-sound-base
Suggested packages:
apmd oss-compat
The following NEW packages will be installed:
alsa-base alsa-oss alsa-tools alsa-tools-gui alsamixergui libalsaplayer0 libfltk1.1 linux-sound-base
```
Clearly Sound is NOT working as alsa cannot find a sound card.