Oops! I lost my volume control on the Gnome Panel!
This has happened to me so many times (and yet with just enough time in between incidents to forget the fix) that I finally decided to make this super quick, super easy tutorial (more like a tip than a tutorial really, and partially as a reminder to myself when I delete the darn thing again in 5 months). So, if all of a sudden you can't find the volume icon in your Gnome-Panel anymore because you accidentally deleted it, here's what you do.
1. Open the Gnome Panel options by right clicking on either edge of the Gnome Panel.
2. Click on Add to Panel.
3. Go down the list until you see 'Indicator Applet' (not Indicator Applet Session) and select it. Click add. 4. You are now done. Yes, feel a bit silly. (But only a bit, since it really should be called VOLUME indicator applet, geesh developers!)
And yes, there are quite a few 'newbie' questions about this in the forums..and this particular not-so-newbie had to look it up too, so don't feel too bad ;)