Regarding the X/Y pad changes, being that I have been a power user of the Kaossilator Pro for so many years, I can tell you (and you can pass on to others) is that before the OS change when you had Gate Arp and Scale on, there was something of preview sound that was triggered before actually using the the X/Y like a Kaossilator. I got around it okay but it didn't feel like the Kaossilator Pro I know and love. After the OS update now the X/Y pad responds EXACTLY like a Kaossilator Pro.
Also this change affects the use of the Gate Arp with out scale as being a more useful note repeat function for making beats. One can get better rolls than before.
Korg PX5d
Korg Quad
Korg KP3
Korg DS-10
Korg PadKontrol
Korg K25
Korg Monotron
Korg Electribe 2
Korg Electribe Sampler 2
Roland GK-3A
Roland GI-20
Fishman Triple Play
BC Rich Guitar