(snip)
Yamaha Tyros/PSR
(snip)
1 pattern for each
(snip)

Roland and Ketron can play 3 patterns per part (Maj / Min / 7th)
Korg it's 6 patterns for Mains, and 2 for other
Yamaha is, as Jorgen saied : you can record 16 tracks per part.
Then you decide witch track will play with witch chord pattern.
So you can for example share the drums for all patterns, but decide to record another bass track for minor chords...

Hi
Wrong. Each part can have different patterns for all combinations of chord types.

How about Audya in comparison?

(snip)Now I understand also why playing Yamaha styles as .mid files sometimes I hear duplicate notes with different pitches, these are probably alternative notes assigned to chords.

How many do Really need to perform a song effectively?)

Tony, for some strange reason, I always seem to find the right one, and I usually don't have to look very far to find it. And, I can improve on it by using the keyboard's onboard Style Creator program.

I think what really amazes me, and Diki too, is the number of people that seem to want the world's total arranger keyboard functions built into THEIR keyboards, when 99.9 percent of those same individuals never take the time to crack the user manual, let alone delve into the keyboard's myriad of incredible features. I know of several forum members here that have never taken an operating manual out of the Zip-Loc bag in came in when the keyboard arrived at the front door.

Cheers,

Gary

Yes, they are. I've written several tutorials, though, based upon what I learned from the manuals,plus practical experience using the products first hand.
Gary