Gary ... I wonder if that's how Louis Prima did it ?!?!? ...

Bill ... I play a technics kn6000 and the 'registration' buttons on the kb are called 'Panel Memory' ... there are eight PMs available at my fingertips - one button press to activate any one of them - and of course I can use any one of the four style variations within the PM at any time ...

I have a number of registrations saved on the kb hard drive for various songs - mostly 'standards' or songs from 'The Real Book' such as "All The Things You Are" or "Green Dolphin Street", and the changes in rhythm are usually switched between some jazz style and a Bossa or other Latin style ...
Like Manuel, I also make sure all the 'settings' - voices, tempo, volume, pan, etc. are set the way I want so that when I am playing PM1 and press PM2, everything is the way I want it ...
I have also used the PMs to start a tune with the 'straight' rhythm, such as 'Jazz Ballad', and then set a PM for 'double time' during an ad lib solo ...

For various 'sing-a-longs' - especially during the Christmas Season, I load "Christmas Songs" from the hard drive, and I have up to 8 PMs set for different songs, so as I go from song to song all I need to do is press one button and everything is set for that song ...

I KNOW I miss playing with my old band, but arranger kb's are GREAT !!! ...
t.