Hi,
I have a similar problem with my MD SPS1 and I see that this post has not solved the issue. Neither that other post (in my case) Impossible to send MD808/909 to my Machinedrum - #16 by mac6mil
So I decided to write to see if anyone has any ideas.
When I send sysex data from my Sysex Librarian to my MD I get the error “Sysex Error Code 1”. Doing different tests I have discovered that it only happens with the projects I have recently saved. All the old sysex data that I had saved for years does not give any problem at all. Only the information that I have been saving in the last few days. So I guess I have had the problem for a short time.
I have tried an AR and an A4 and everything works correctly with Sysex.
I’m using a MacBook Pro (13-inch, M1, 2020) Xip M1, an audio card (Scarlett 18i8 3rd Gen) through which I run midi cables. It’s all well connected because as I said the AR, A4 and the old sysex data I had in Sysex Librarian from the MD can be transmitted without any problem.
I’m a bit desperate… Any ideas?