I am using PFS3.
Is the music that I am hearing during MI 1 titles and the "Part 1" screen not MIDI? If it's not and the rest of the music is MIDI, and somehow deactivated, then I guess I partly understand.
I remember that my old 060, ConciertoIV-setup did a great job with scommVM. I am not really surprised that mu 1232 is struggling a bit.