Bernie,
I had the same problem. I was using the Ketron SD7 for gigs but it is just to heavy for me. Some days I play doubles and twice last year I did triples. Just to much weight to lug around that much so I went to the Ketron SD40 Module and will start using vArranger to have something a bit different for some gigs. My SD40 setup total weight including a Bose S1 pro speaker is about 25 pounds! I still have my Ketron SD2 Module and will also use it with vArranger at times.

Deane