Hi Ketron user
I had reply in Lionstracs forum too.
yes, I'm the official producer of the Solton SG-X, SM-X is the new board derivated from SG-X, but with 4 outsputs.

I know about this problem, is a OLD problem.
You just get the old firmware release 1.3, you need to replace the LCD micro with the release 1.8, that merge all the midi inputs data correctly to the output data.

At the fist delivery os SG-X, they had approved the firmware and then, after testing again it with some other keyboards, we had find this problem.
I had resolved this problem, reprogrammed all the remain SG-X and send a quantity of new micro.
unfortunately, they till now, don't have sent back to me the old micro and don't want to pay any shipment or more expense.
Now we have find some internal LCD broken links to some program change, but they dont want to pay the rework, so at this point I don't care.

I know that now is not your fault, let me know in private message your address and I will send you by post a new micro, then you send me back the old one.
I think that is the best fast way or you will waiting months more.

About the midi problem that we know, is the SG-X working well? I mean, the sound quality and dynamic with any midifiles are good?
Let me know
Domenik