I can't tell if you mean:

a) You have winamp in both the taskbar and systray
b) You have winamp in both the systray and an amp module in litestep which is on your "bar"

If it is a, can't you just change that in winamp settings? If it is the second you should really let us know what amp module you have. Check the theme.rc and see if its geekamp or dynamp or what have you, and then someone who uses an amp module might be able to help you.

I alas, do not, so can only tell you to do some reading in the docs. Make sure the amp module is compatible with your version of winamp.