Also, if your Korg has a style called Bebop1, variation four provides four bar drum breaks (four different ones), so you can trade fours between your lead voice and the drummer. Very jazz, very cool.
I'm not sure I understand that. Could you explain it further?
I did listen to the Bebop style on the PA3x.....is that different from Bebop1?
I noticed that if you hit the "fill" switch 2x rapidly, it will keep playing the "fill" until you disengage it.
Here's a video that illustrates 'trading fours' with the drummer.
http://www.youtube.com/watch?v=kFjKk6gd-cMNote that at 0:18 the pianist gives a signal to the drummer and bass player to start into trading fours, i.e., four bars of piano, four bars of drums, in an alternating pattern.
Now, I don't know about the Pa3X, but Variation 4 of the style called Bebop1 on my Pa1XPro plays this pattern. If you have a Pa3X, give it a go. Maybe it's the same.
The trick is to play the first 12, 24, whatever, bars of your tune in Variation 3, then switch into variation 4 for this 'trading fours' for as long as you want, then break back into variation 3 to keep on swinging. It's a lot of fun to jam away on this.
On your other point, hitting a 'fill' twice quickly in succession to trigger repeat fills has been a feature on Korgs for several years - my old i30 had it, and I don't think it was a 'new' thing, even then. Again, a useful feature if, like anything else, it's used judiciously, of course.