I'm looking into buying a Boss DR5 to use as a backup band when I play solo, but it only holds 20 songs in the internal memory. Does Roland (or anyone else) make a similar machine that can do drums, bass, and a couple of other voices for backup, but with more songs in the memory? I was told to hook it up to a Roland MC50MKII sequencer, but I'm not sure how many songs that has in the memory or on a single disc. Any ideas?