The soft scrolling effect/animation works just fine on my Music State website using this method (IE included).
Make your menu item an external URL and use the module positions with "#gk" in front of it:
Examples:
#gkMainbody
#gkBottom1
#gkBottom2
#gkBottom3
#gkBottom4
Take note of the address bar in the browser as you click the menu links.
See it work on my live site:
http://whigfest.com/Hope this helps!