I can't help you with the technical questions,
but at this point with
little technical help available from Roland and with so many S-760s
available for so little money, why not just spring for the S-760? There
are a couple on ebay right now for $125-169. I paid a lot more for mine
seven or eight years ago.
Ah, but I have one.
I was just wanting to put a hard drive in my S-750. :)
thanks
tim