mk47at: I assume that you are talking about
Doom 95, which has no midi support and can only play mus files. At first I assumed that the difference you've mentioned were caused by Windows 95's midi synthesizer, but without midi support, that's no a possibility.
MIDI is many things. It doesn't require to use the
standard MIDI file format, and really
is a stripped-down MIDI file. Most games with a MIDI soundtrack in the nineties actually used some custom variant of MIDI as dictated by the sound backend they were using. For example, Miles Sound System used [url=http://www.vgmpf.com/Wiki/index.php?title=XMI]XMI, Human Machine Interfaces' sound system used
or [url=http://www.vgmpf.com/Wiki/index.php?title=HMP]HMP, [url=http://www.vgmpf.com/Wiki/index.php?title=Category:Formats_that_Output_to_MIDI]etc.[/url]
The point was that at the time there were many different types of sound cards and, before Win95, there was no single system-provided interface for sound and music output. So each game had to use its own sound system code, and generally it made sense to use one of the libraries that already existed and handled all that instead of writing your own. They had to be able to transform a series of MIDI-like instructions into, depending on which sound card they were working with:
- Actual MIDI instructions, for General MIDI cards
- FM OPL instructions, for Adlib/Sound Blaster cards
- Perhaps something else? There was no shortage of weird hardware in the era
MIDI itself was subdivided between various interfaces, such as
, the [url=https://en.wikipedia.org/wiki/Gravis_Ultrasound]Gravis Ultrasound, and so on; as well as having to deal with different instrument mapping depending on whether you were talking to a
General MIDI card, an
MT-32, or something else. With some cards, you could load your own instrument banks instead of following a set standard of instruments, but again the way to do that varied depending on the card, a GUS did not use the same method as an AWE-32.
Anyway, all that said, there was never a more "refined" version of the soundtrack for the Windows re-release. It's all the same MUS files, and how they sound depends entirely on the backend being used. Perhaps when one played Doom in DOS they had the OPL backend, and then when playing Doom95 they heard them playing through the General MIDI backend, and then assumed the difference was in the game instead of the hardware.
My advice would be to try ZDoom because it allows a
lot of choice for MIDI playback.