Lost my instruments when upgraded to GB 2.0?

I had purchased the old Garageband for iPad some time ago and I don't use it too terribly often, but somewhere between the upgrades to GB 2.0 and IOS 7, most of the instruments have been greyed out. I know for new GB users they can get the app free then get all the instruments as an in-app purchase.....but since I'd already purchased GB, is there a way to restore all the instruments?