This was just poster at Ultima Aiera. Some information about patching Ultimas 1-4 with better graphics and musics: http://www.ultimaaiera.com/blog/patches-and-updates-for-the-good-old-games-ultima-releases/

It worked rather nicely. It took a while to get it set up properly but once I figured it out it worked. The only thing I would mention, the title screen doesn't change nor does the gypsy scene where one decides their class.

But, it plays different than the xu4 game by the way. I think it is a bit easier. The xu4 version uses bits of Ultima V in the game play.

But great recommendation!