How about doing what the vogons discussion suggested, ie. using the PC speaker sounds instead of Adlib/Soundblaster? According to that discussion, they tried to use the Adlib OPL chip for playing samples, which is kinda what it was not supposed to do. :)
(I have the Wizardry Archives compilation too, but I've really just played Wizardy Gold (ie. the Win3.1 version of Wizardry 7).
AFnord: The game does feel a bit empty without any sound, but it does beat hearing that opening/closing sound over and over at least. So I'll take your advice and play it without any
Dosbox does by the way, as far as I know, not have any support for Roland
As long as you installed Munt in Windows, or have a real Roland unit, DOSBox can pass the MIDI messages to the MIDI unit (or Munt), and the Roland MT-32 sounds are played fine by either Munt or the real Roland MIDI module.
There is also some special DOSBox build ("Ynghwog's" or something) which has "Munt" built in, but I prefer installing BASSMIDI+Munt separately as that works with all games, even GOG DOSBox games not running in the special DOSBox build.
But, I am unsure if Wizardry 6 had any Roland MT-32 support anyway. MT-32 couldn't play digital samples, e.g. speech or digitized sound effects.