Block Lettering ...THX

Everyone knows that “THX” surround sound logo thing that appears in the beginning of movies, right? Well, my school’s initials are “THS” and I want to modify the THX logo to have an S instead of an X…it’s for the dvd yearbook.

I’ve tried, picture attatched, but it looks …horrible. I don’t know how to make the letter have the gradient like the T and H…any help?