Monkey Island 2 has great music with a Roland MT-32; however, most sound effects can only be heard with the AdLib or Sound Blaster selection. If you want both, you are forced to use ScummVM, which in my opinion seriously breaks the whole retrogaming experience (and its OPL2 emulation is hideous IMHO). Until now.
Attached find a patch that allows for Roland MT-32 music together with PCM sound effects for the Sound Blaster, and AdLib sound effects when they are the only ones available. The patch consists of two files:
SOUNBLAS.IMS replaces the original SOUNBLAS.IMS, so you have to run the game with "MONKEY2 s". Replacing ROLAND.IMS would have been the more logical option, but unfortunately, the game's script code knows what the selection is and will not even bother to try to play Largo's "whoa!" sound effects with any selection other than Sound Blaster, so it is this driver that has to be replaced.
REORDER.COM must be run once in order to hear PCM "spitting" sound effects. The reason is that these exist for PCM, AdLib and Roland, but MONKEY2.EXE will give the Roland file to the sound driver because that one appears first in MONKEY2.001. REORDER.COM simply reorders them so that the PCM one appears first in the file. It must only be run once to modify MONKEY2.001 in the manner described; then it can be deleted.
In theory, it should work will all language versions. Comments on whether it does are appreciated.