I'm also interesting about topic as I still have working D-20 and just yesterday I connected it to my VM Windows with STeem (btw STeem SSE has now version 4, released in December).
I already wrote SynthWorks Library/sound banks reader for Windows and going to improve it - Caged Arts sound banks are already supported also.
My final task to have universal reader of sound banks,created by any of D-10/20/110/MT-32 Atari editor and convert between them.
So, Charles (Hi, didn't hear from you long ago!) - you told about 20 editors for D-110 , but it your post were just some of them - could you please look if you have more editors and share them ? I suppose, that most of D-110 editors are also valid for D-10/20...
Robber, could you please share your Synthworks original disks ?
Unlucky, I found this forum too late, I was in Amsterdam in December, so we even could meet and 'een biertje hebben'