I got the MT32 device to work with the forked CVS build that was linked to. Are there other ways to get MT32 to work?
Anyway, the sound quality with MT32 was far superior and I was quite impressed when I heard the intro music. However, as robertmo indicated, in combat the sound effects are not much better, still being the "notes" and "chords" instead of digital sound effects that you get with the PC speaker (e.g. the actual sound of a missile launching when you use the Earthling Cruiser's weapon, as opposed to just a tone).
Btw, I wasn't sure if I was using midi or adlib at first because I was used to entering the command line parameter /s:adlib to get my soundblaster to work in the olden days. I dont know what the difference is between adlib and midi, but what I hear is the MPU device, I guess.
So, I still want to get the PC Speaker to work.
Regarding the PC Speaker: I tried upping the PC speaker's audio rate to 44100 Hz, and I also tried upping the CPU cycles to 10,000 but still I got the buzzing sound. I could hear, extremely vaguely, some sound effects in the background, but they were overwhelmingly drowned out by the buzzing sound. I also had the mixer on and had that set to 44100 Hz.
If anyone has any further suggestions to get the PC speaker to work, I would be most grateful. I tried older versions of DOSBox and it didn't help.