How to make a Multi-Output Audio Device for Snow Leapord

Hey, so i am trying to make a Multi-Output Audio Device for my mac desktop because when i remotely access it from my ipad, i want it to be able to play sound through both the ipad and my computer...i did this fine for my mac laptop (running lion)...because it had a nice option for multi-output device unstead of agregate device.....agregate device doesnt work no matter what, and no matter how much i try, or look at help disscusstions on the matter, i cannot get both devices playing simultaniously on the desktop, only one will ever play at a time...please help..thanks