Thanks Curt
It looks like this is the only way to go. My Kenton Midi Host receives the USB from the DM48 and provides midi sockets for SD40. In fact, before I was told that the SD40 was class compliant, I used the Kenton for just the DM48 into midi in#2. Chris had also mentioned this. The only thing to figure out is in#1 setup.

Controller midi out In#2 keyboard and SD40 to #1. Midi port for #1:
Midi play to style and voice out is piano voice, to keyboard is the same as my controller. If I could direct my instruments, I would be home free. My ignorance showing badly, sorry.

I have to leave for a gig, will take this up again later this afternoon