Hello!
Take a look at 'spectrum' VB example in Bass package.it
draws the freqency spectrum in two simple style but if
you want to have something like WinAmp Spec,you could
create it simply modifying Spectrum example source code
(you may modify it to draw lines or boxes instead) with
out having to write the main code.just change the visualtion
callback procedure details
hope this would help u a bit