no, you're not limited to disk, the sd transfer is as fast as the panel operation, and are not limited to having 3 transfers in limbo while you decide where to overwrite things, thus much easier to rearrange multiple all customs where duplications may be required for specific play orders, you do not risk losing the registration, user sound and user pad information which could happen with a wrong panel push, finally since Kenny is confused about composer to custom transfer in the first place, it’s an instant fix avoiding that problem.