Way back when somebody brought up the point that you can't change styles thru sysex. I'm not sure if this has been addressed on the newer PSRs (Steve, are you listening?). Anyways, here's a work around I came up with. You can set aside 2 or 3 registrations in a bank that just have the style information saved; no voices, tempo, transpose, etc.. Then you could set footswitch to flip thru only these registrations.