Hi,
for anyone who might be interested in korg style structure , here goes.
Onboard styles are set up in a particular way, but for those who may want to create user styles, and I don't necessarily mean from scratch, styles can be created from mix n matching onboard style tracks, you can even copy "pad" tracks into a style & vice versa.
All the style parts in the korg can be up to 32 bars long, including the fills.
One main difference between between fills, intro's & endings is, they only contain 2 cv's. ie one for maj. intro's( cv1) and one for min. intro's ( cv2)
wheras variations can have up to 6 cv's .
Another interesting thing is, if you tap an intro/ending/ fill twice, it will keep looping, just like a variation.
With fills , you can also set which variation they will go to.
ie you could set fill 1 to automatically toggle between vari 1 & vari 3, or work it's way up through the variations, there's about 14 settings to choose from, for each of the fills. ( or you can just leave it to off, and it does it's own thing)

Also, you can actually have a different time signature & tempo's in each of the style parts ie if you wanted to do a xmas medley,you could have variation 1 & 2 & fill 1&2, as 3/4 , whilst vari 3 & 4 are in 4/4.

There's actualy nothing stopping you from using a fill spot to create additional intro's, or an intro spot to create additional fills.

With the factory intro's they're set up a particular way, ie intro 1 has a chord progression built in, it's the fanciest of the 3. Intro 2, you actually play your own chord progression, & fill 3 , is a Count in.
That's the way the factory styles are set up.
But, again , you can have whatever you like.
You could have 3 fancy intro's with built in chord progression.
You could have 3 where you play your own chord progression. or you coulld have 3 count in's if that's all you wanted.
Inoticed over on the korg forums, a number of members were under the impression that the intro types were set ie you have to have a count in on intro 3. not the case.

Also your major ( cv1) & minor intro ( cv2) don't actually have to be the same length. They do have to use the same instruments, though. Intro 1 maj ( cv1) could be 8 bars, intro 1 ( cv2 ) min. might only be 2 bars.