Let me tell you, from one who has used both single and block registrations on an Ketron, the Roland system and Yamaha registrations and the Korg Songbook..
The Songbook is so so SOOOOO far in front of the Ketron system (and Yamaha for that matter)...Ketrons was a good system about 12 years ago, but with the first Songbook tool added for the PA1x series, there had been no competition...Only arguments from people who have only used one system (or company reps
) who do not see the forest for the trees....
Try selecting a registration on a Ketron or Yamaha from an iPad!!! And that is just one trick....Try having an "INSTANT" access to 9,999 entries, any one of which can be selected with the press of number, or a button or a pedal push, and all loaded in approx half a second, no matter WHAT resources are used!!!
No guys, the Korg Songbook is the single tool that separates all the others...one can argue for days (and fairly so) abotu the sounds and styles etc etc, but there is non argument re this brilliant tool!!