you're right, the manual doe snot lay this out clearly. You have to piece it together.

these may help:

from the user manual page 3-2

User –• 36 great-sounding presets that you can overwrite with your own custom tones. The User presets are numbered 1A - 9D and can also be recalled using an optional FBV foot controller. Check out Appendix B for more info. A factory reset (see page 3•2) will restore these presets to their factory defaults.

also check this

and this