It's hard describing something as dynamic as these visualisation effects are, and since a picture is worth a thousand words, thats what you get!
To use these AVS presets, download them and save them into
"C:\program files\winamp\plugins\avs\" (You can make a subdirectory here if you wish).
If you did not install Winamp in it's usual place, then you will need to find where you put it, and save these in the \plugins\avs directory. Obviously, you must have installed and use Winamp. The Advanced Visualisation Studio can be found in the Visualisations section of the Winamp Options window.
Most of these are built for dynamic style music with obvious beats, not easy listening. They also run pretty well on an AMD 500 + TNT2 + 128M Ram, in a 650X400 window.