Bill,
If you are using nothing but 3rd party styles for each gig, then the best method is to just load them onto a floppy disk, give each style file a song name, then using the USER style button, select the style directly from the floppy disk. That's what inspired me to create the Gig Disk series a couple years ago.
If the style files for the gig are internal styles, then merely create registrations for those styles, again using any of the above techniques to access the registrations. The registrations can also be stored directly on a floppy disk, and in fact they can be saved on the same floppy disk that you stored the 3rd party style files on. Registration files are extremely small and a couple hundred would take up the same space as two style files.
Keep in mind that you also have the MFD to work with for onboard styles, and the memory size is limited to approximately 2200 entries. That's more songs than most folks even know, let alone can play.
Now, to set up for a gig, merely sit down at the computer and copy the 3rd party style files you intend to use that night on to a floppy disk. Then, just to be on the safe side, make a second copy--floppies can go bad.
If you have large numbers of registrations to work with, you may want to download a copy of Regedit, which is a great program by Heiko Plate. Unforunately, I no longer have the link, but I'm sure someone can assist you in finding it. Additionally, download some of Michael Bedesem's programs, which will also save you lots of time and make things a lot easier for you in the future. You can find Michael's programs at
http://psrtutorial.com/Help/help.html Good Luck,
Gary