When I first got my SD7 I was not aware of an issue with the SD7 OS which was the OS looks for voices as they appear within a specific voice folder. Example - piano folder might contain 30 voices "out of the box". So, you the new user change the octave of a voice and save it as a user voice in the piano folder - guess what - that changes the position of every voice in the piano folder which means styles might not have the desired piano voice when selected.
The solution to this problem is to number every voice in every folder so they stay in sequence and add new user created voices at the end to the list. It works great once you get it started.
I absolutely loved my SD7 and recently sold it to Don Mason. I ordered the new Ketron SD90 module to replace the SD7. The first thing I will do is make sure I number every voice in every voice folder. I use a computer connection to do this and it is very simple to do.
When I get my SD90 I will post my experiences with it.
Deane