This discussion is helpful, but somewhat overwhelming with the many software products out there. I've got a basic version of Cubase, but have not used it. The reason----I don't have an interface as yet and don't know which would be the best investment. I'd like to record guitars and electric keyboard with Realband. I suppose any USB or firewire unit would work? I'd hate to buy something and then find out it won't work, is too limited in options, or some other problem. The cost is not a factor. I'd buy anything that's easy to use and will do the job effectively.