Samples from the Yamaha RX-5 and Akai XR-10 can be heard
here.
I don't think there's a library of samples from the U-110/U-220/their respective cards, but demos of them can be heard at Synthmania.com (
U-110,
U-220,
SN-U110-02 Latin & F.X. Percussions,
SN-U110-09 Guitar & Keyboards) Demos of SN-U110-03 Ethnic (among other cards) can be heard
here. (Most of this series' sounds seem to have originated in S-50/S-550 libraries, anyway. Like most of the libraries I've mentioned, you can convert them to WAVs and such with the proper software if you manage to get a hold of them. Most of the floppy disk images can be found at
SGroup, L-CD-1 disk image is available
here)
Korg
M1 and
T3 demos can also be heard at Synthmania.com. A virtual version of these synths for use on PCs was released a few years ago as "Korg Legacy Collection Digital Edition."
Akai MPC-60 and MPC-3000 libraries are collected in the "Akai CD-ROM Sound Library MPC2000XL Vol. 1" CD.
Akai S-1000 libraries are collected in the
"Akai CD-ROM Sound Library Vol.2" CD.
Anyway, I still have some more stuff to be added, I'll get to that soon.