I think the DOS mode just don't read all the datas of the MIDI files like windows can do.
(and with maybe a lower speed... depends on how today's "dosbox" is setting up.)
Midi musics are stored in AGG files.
In PoL's AGG file, there is just the 6 castles midi files... So the lands musics didn't change...
(maybe... My H2 version is a Deluxe version (kind of gold version..) so I can't be sure if they changed datas of H2.AGG )And I bet that the DOS version of the game read the same AGG files.
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~Lands of Enroth~