Hello,
The Yamaha MU128 sound module has been likened to the Yamaha PSR8000, and a lot of sounds available too. The "MU" Range of sound modules, it seem, gets overshadowed by the roland JV/XV series, but they are good in there own right. Here it is
http://www.harmony-central.com/Newp/SNAMM98/Yamaha/MU128.html Maybe it not a recent module, but that doesn't mean it is not good (you can expand it by plugins like pro 9000 - and you can't do that on the PSR9000.
Andrew