Hi Jeff,
Thanks for the explanation, I understand now especially as 3 are rack mounted synths. I had a DX7 a long time ago, great sound. I recently got a Korg M50, does all I want and superb sounds. I too also used the VST's for a long time but I'm getting back into hardware of late and trying to get to grips with midi again.

I'm afraid I don't know enough about midi to be of any help but the other guys seems to know what they talking about, it's a great forum for friendly help.
Regards. Jeff