So I guess patch location 16 (a,b,c,d, empty) can be used to make custom sounds. Also, can song sounds for 50, 60 70 etc... be accessed from the Shortboard mkII? I don't think they can, or I haven't figured it out yet. One more thing. My boss gt 10 doesn't work well with the Spid IV 75. I guess it isn't compatible. Any comment on that? Thanks M.