Hi Bill
Thanks for the reply.
In regard to simultanious voices. I am sure it is multi timbral,ie it plays full 10,12 midi tracks at once with no latency. Is that what you mean ? I did not set any channel as it is GM. I just used the Midisport 2x2(USB),and designated Midisport as out port in my sequencer software.

Now, when I use my Axiom controller, I simply attach my midi out from it to the in port on the SD2. It works great that way too,for straight playing. I am sending on Ch 1, but I would guess it is receiving globally.

I now want to use the SD2 for both at the same time. I only brought the MidiMerge into play because I am combining two midi outs to the one SD2 in port.

I guess I don't understand why two datastreams can't be merged, but work independently. What then, what do I know ?

Bernie