Don't know what to tell you, but it works perfectly for me. The only place where I can see you might have a problem is that this is all one line (the site is breaking it in to two lines):

*Script exec !IfEval ( "%{amptmp}" = "Playing" ) '!varset ampplaying 1' else '!varset ampplaying 0'

Maybe load order matters too... I had all my items in Step 1 immediately after the ThemeAuthor line at the top.