Cool. I hadn't heard those demos before.
It seems likely they correspond to the patches from the cassette which came with "Expressive FM Applications", by Sal Galina. I did play those, briefly, with my WX5, but they sound much better on the demo - probably due to the player, more than anything. I'll have to give them another go. I looked for the book a few times, but it's mostly sold for stupid prices. It doesn't seem to be much more than a pamphlet either.
I've attached what I have - a bank of 32 patches and a bank of performances (usually 24).
It's quite possible I found them somewhere in this forum, but I can't see where.
I realise now that JSynthLib only imported the patches, not the performances, so I've only tried the patches on their own. That would be part of the difference too. I'll try again, soon, and send the performances direct to the TX81Z, with MIDI-OX.
Here's a screenshot of the Sal-Voices.syx patches bank, imported into JSythLib, showing the patch names:
The two INIT ones at the end are starting points for making a breath patch and a keyboard patch. I think those were used for exercises in the book. The don't do much; they just seem to be intended as a blank template.