I tried several ways of handling registrations, OTS and user voices a number of years ago and simplified it as follows:

I use one set of registration memory (preset) buttons.

1 piano 1 octave lower, piano, string.
2 Jazz guitar, vibes, another guitar
3 George Shearing block chords
4 Glenn Miller reed Section w harmony
5 Sax Section w harmony
6 Saxes octave unison
7 Trombone section w harmony
8 Brass section w harmony

I have about 30-40 of my favorite solo voices saved under User Voices. By pressing the harmony I have the desired harmony or effect for each instrument ready also.

At this time I have the instruments grouped according to type such as keyboard instruments, guitars, harmonica, reeds, brass, misc. I use a number and/or letter before the actual voice name to force them into the order I want to easily find each instrument quickly on the fly.

This allows me to easily find any instrument I want to use in a flash. Although I tend to use the same sounds for each genre most of the time, this set up allows me to pick anything that pops into my head that seems right for the moment.

Here is a link that shows how I originally used the User Voices about 12 years ago.

http://www.psrtutorial.com/sty/OF/Vpsr2k.html

Another nice feature on the Tyros 4 is if you push on the style button you are using it has a button where it will show you the factory OTS setting for all four buttons. No more guessing or memorizing needed. I use this once in awhile just for variety. The have some great sounds all set to go that really fit each style.

I have changed only a few OTS settings as the above method is so simple to get around and a lot less work.

Scott