Hi Denis,
I am not comparing the X1 to the SD1, I was just referring to the article on Synthplanet web site that describes the SD1 as a troublesome keyboard: “In an attempt to solve the many problems of this instrument, Ketron has - at last - released a new system software version for use with the SD1”

I personally own an X1 and I am very happy with the Ketron products, I was just wondering what was the reason for his statement on Synthplanet.com
May be I am reading too much into it !!

Maged