The Ultima Underworld 1 Patch is needed for floppy disk versions. The CD-ROM and GOG.com versions are already fully patched. An unofficial General MIDI patch is available here as well.
To run correctly in DOSBox change cycles=auto to cycles=max.
The GOG.com version's sound is incorrectly configured by default, resulting in misplaced effects such as piano sounds for footsteps.
6 -1 -1 -1 sound
2 7 220 1 sound
Ultima Underworld 1.boxer
C Ultima Underworld 1 and 2.harddisk