Donny,
I am completely satisfied with my Tyros 4s. However, I have always liked the overall sound of the Ketron keyboards and modules. I currently use a Ketron SD2 unit with Dan's vArranger - used it on a gig yesterday and got some nice comments from the audience. I got a phone call from AJ this morning and got a few questions answered. So we will see. The real problem for me would be styles. Sounds like the SD7 would not be backward compatible with the older Ketron styles and that might be a problem due to the kind of music I play which is most of the songs from the 1920s-1960s. If Don Mason holds another Jam in June I will drive over from Dallas with hope AJ will be there to demo the SD7. Regarding styles - if all of the manufactures jump on the Audio style train backward compatibility of styles might become an issue with all of them.

Deane