Xubuntu : 8.10 to 9.04 Upgrade - No Sound

I successfully installed Xubuntu 8.10 on a slow end machine and fulled updated all the software. I then couldn't help myself and click that nice button saying, "Upgrade to the latest distribution 9.04". Which I did.

I found the sound gone, came back and then gone again after creating a new account. I am not sure if this is for "Xubuntu" or for all the them, well here is my solution.

Major upgrades have known to require some little fine tuning so this normal really :) Yet I have sneaky suspicions of user error from time to time. ANYWAY!!!! Read on

Exceptions
I chose to not let it change the "menu.lst", I modified the boot parameter of the kernels to have "rootdelay=90" and "acpi=force" at the end to aid the old machine boot up to really boot up and shut down efficiently. I will explain in another blog entry soon about my boot parameters [INSERT LINK HERE].

Issues Found
Sound disappeared on me.

Resolution
One of the volume controls has been muted. To Unmute you need to reveal some volume controls, by default Xubuntu hides them (Not exactly sure why, yet I have a funny feeling it is to make you aware you can just show the controls you only need to see).

1. Click "Applications->Multimedia->Mixer".
2. You will see a window pop up with a pulldown showing the various modes which could be OSS and/or ALSA based at the end. Go through the first two and show all your volumes.
3. Once you click ok you will see various volumes in various tabs. It is probably the first first you should worry about. Look out for "MASTER" and "PCM-??" controls and also the mute button which is showing red "X" next to a speaker or on top of it.
4. Play a CD track or something that requires sound, and fiddle with the MASTER and PCM. Hopefully you should be able to hear your sound again.

End of Line. (Getting into the mood for the new Tron film :P)

EDIT: TO BE REALLY REALLY SURE:
run "alsamixer" in a terminal, (Applications->Accessories->Terminal). It is just like the GUI only in text form.

There has been odd bizzare reports where the sounds is more properly saved using that command, oh and then press "ESC" to save :) If you view both the GUI volume control in GUI and TEXT form, you will notice they both are synched together.