Frank,
On the i30 I can take any sounds for lower, sub and main and set them to a number called a keyboard set on the i30. Like number 11. I can hit 11 and those sounds will play on any style, or any of the 4 variations. And there are a hundred sets I can set like this.
I can even push a lock keyboard set and change styles or variations and still have the sounds of set 11 playing.
As a matter of fact for 60 percent of the stuff I do I lock keyboard set 11 which is basically sub jazz guitar, main piano and it is locked in full keyboard mode where the whole keyboard is either full piano or jazz guitar with the push of one button.

I thought you could do this with any keyboard. Particularly any Korg. I guess I'm not understanding you.

I'm going to ask on the Korg PA1X forum if it can be set to do this like the i30.

Like I said, maybe I don't understand what you're saying.

I noticed on the Tyros each time you change the variation, different instruments become the right hand part. I didn't like that. If I'm improvising a jazz guitar solo and I'm in a jazz guitar grove and then I change the variation for more kick, I don't want the guitar to change to a trumpet. I may not be in the Trumpet mood. Ha! Ha!

All of us are different. None of you guys play like me and I don't play like you guys. So who's right and who's wrong? Nobody!