For what it's worth, making multiple regis for songs and saving them in Block Regis does not work properly for fast changes. I think the problem is with the seek time on a disk opposed to flash memory. There is an unacceptable lag and I have to hit a regis twice to make it work. The block is great for other uses.
I will continue to use my buttons.

I find the Audya so good in many areas that, like all keyboards, none does everything the best, and there are always work arounds.
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pa4X 76 ,SX900, Audya 76,Yamaha S970 , vArranger, Hammond SK1, Ketron SD40, Centerpoint Space Station, Bose compact