It's quite simple. You leave the sound card configuration in dosbox.conf as it is, Soundblaster 16 by default I think. Then you fire up DosBox, run install.exe or setup.exe, not sure right now which one it is for this game, and select Adlib, there's only the option for music, no sound effects. After that you should be able to hear music playing in the game.
About the issue with the darkness, is your monitor set to a rather dark contrast by chance? If not, what version of DosBox are you using to play Ultima VI?
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