The new piano samples which come in the SD1's hard drive and need to be loaded into the keyboard either manually or with an auto load function can not be fully loaded into an original SD1. The reason for this is because ketron added more memory into the SD1plus to accomodate for these new larger piano samples. If you load them into the SD1, they will not sound as full because some of the samples will be missing. The memory I'm talking about has nothing to do with loading your own larger samples or sampling on the keyboard. This has not been changed, but rather only affects the sound files the Ketron factory have developed for the SD1plus.
George Kaye
Kaye's Music Scene
Reseda, California