YIKES! 1st major anomaly detected ....
I'm perfectly willing to read the manual, but I haven't yet, and I found a VERY annoying paradigm that I hope is adjustable.
When using the drums without accompaniment, and playing right hand piano and left hand bass .... all is well UNTIL you trigger an ending pattern - it shuts OFF the left hand! Hmmmmmmm...... anyone ever hear of this? I am playing real time sounds, and I can't afford to have the drummer chase the bass player out of the room before we end the tune! C'mon Korg ..... what gives? Is that even practical in a typical arranger style of play???
(I'm almost positive this can be avoided, but I need to study further.)

Comparing to Yamaha - the intros and endings are similar in approach, but the Korg gives the option of triggering any of the 4 fill3 while staying on the A-B-C-D section of the arrangement. You have the option of triggering with the variation button, or a dedicated fill button.
The lyrics and score window is a bit more labored than the Yamaha, but again, to be fair - I haven't read much of the book - maybe there are adjustable parameters that I need to find.
For now - I LOVE the sound, I LOVE the feel, and I LOVE the layout. The drums are so real sounding ( as Korg usually is, but even MORE so )
If I find a perfect=fit case I won't even mind the extra few keys that much. The unit is just under 47" long but only 14" deep - most 76 key cases are over 50" x 18". Way too sloppy and wasteful for me.

I'll check back again, but I have no more playtime tonight - it's a school night. yawn ........


...and Tony - the dealer offers a return policy. It's standard practice with most on-line companies I deal with... in fact ALL of them, so far.