IPad 2 can’t download GarageBand, says not compatible

Just bought an iPad 2 to use with my Alesis IO Dock, but when I try to buy or download GarageBand from AppStore/iCloud it says GB is not compatible with this iPad. Will I be able to download an older version for iPad 2 because iO Dock is specifically made for the iPad 1 or 2 that docks inside of it. Anything helps, thanks!