Robert,
As long as you select a single parameter in the Registration Memory Contents page the registration information can be saved and recalled. For example, you can save just the Pedal or Mic settings without saving anything else and the only thing that registration button will recall is the selected item. You do not have to save a style, voice, or anything other than a single piece of information to make the registration recognized. Keep in mind, however, that the information that is currently turned on will remain functional unless it is turned off. If you wish to use a particular style but not have it playing during certain segments of a song, such as during a time when you are playing your own instrumental introduction, you can have that style volume turned down to Zero in registration number 1, then set the style volume at 100 in registration 2, and use the remaining registrations for various voices, or for turning off certain parameters or style voices. All of this can be saved into registration memory.
I just did this on the PSR-3000, which has the same registration features as the T2. Essentially, the keyboard will do exactly what you tell it to do.
Good Luck,
Gary
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Travlin' Easy