Noise-band synthesis

["Albert Bregman, Tel: 514-398-6103" <IN09@xxxxxxxxxxxxxxxx>]

Dear list,
   Does anyone out there have an algorithm for synthesizing
narrow-band noise with a very steep skirt?  I know that one
way to do so is to use sine waves in random phases and
densely packed in the spectrum.  Does anyone have a C program
that does this?  Are any other methods available?  I know that
asking the list is the lazy person's way of getting answers to
questions like this, but what the hell.
  - Al Bregman