I asked the Roland demonstrator about this.
When you select "auto fill in" you will get a break/fill-in when you switch "up" to the next variation.

So 1st to 2nd is the first fill in, 2nd to 3rd the second etc. It does this also when selecting a "lower" variation, so from 4th to 3rd is the fourth fill-in, from 3rd to 2nd the fifth, etc. It also does a break/fill-in when you hit the button of your current variation.

BTW, the four variation buttons also trigger the four intro's and endings. Intro one is just drums, and probably the one you will use a lot if you want to use a programmed intro. Intro two is an interesting one. This one has no chord progression, but is created to enable you to play your your own chords during the intro, thus making the intro blend much better with the song.

I hope I explained it ok, because English is not my native language.

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Tom NL

[This message has been edited by Tom NL (edited 12-04-2004).]