Apple posted a KnowledgeBase article Thursday clarifying that GarageBand projects created with the Mac version of the software and the iPad version are not interchangeable. this means that users won’t be able to start something on their iPad and finish it on their Mac, or take something on the road with them on the iPad that was started on a Mac.
Apple released GarageBand for iPad on the App Store for US$4.99.
Update: As noted in the comments below, the KBase article also notes that, “A future update of GarageBand for Mac will open songs created in GarageBand for iPad.” Our apologies for missing that rather important note.
GarageBand for iPad Screenshot