After reading online that Alsa was a better sound quality than PulseAudio, I decided (Stupidly) to remove pulse and just run Alsa. I lost all my sound from every output.
I then followed the sound troubleshooting guide on this forum and have my sound back on my USB headset
To cut a long story short I then tried to re-install Pulse only to find that I have lost the ability to change the audio output to anywhere else except my headset....see attached screenshot, there are no entries in the sound control panel anymore.
Please bear with me, I only installed Ubuntu 12.04 LTS less than 2 weeks ago