Bernie, I understand what you are trying to do here, and I am sure that you know that vArranger can do this and a lot more with such ease and flexibility, which is why I like software solutions in many situations. Anyway, I would love to be wrong about this, but I don’t think the SD40 can do what you are trying to do. However, you can connect the DM48 to the MIDI In 1 (GM) on the SD40 via your Keton USB MIDI host. This way, the two USB MIDI controllers will be totally independent from each other, and you can play any solo patch from the DM48 by sending PC messages.

Does the DM48 send PC messages? It looks like a serious MIDI controller. Can you play it without holding it with your hands like the Jamboxx Pro, which I own?

Chris