The list isn't wrong and I have added a few entries myself 😀
They might be negligible, but that wasn't why I felt I had to comment. You said that the MT-100 does the same as an MT-32 and that simply isn't accurate.
VOGONS is pretty much THE place for retro knowledge and we try to keep things accurate. There is always place for personal preferences and opinions though 😀
Now coming back to the differences, yes they are subtle but once you know about them they can drive you mad.
Example of a sound that only the MT-32(Old) plays correctly. Play the Heart of China and get to this screen:
http://www.youtube.com/watch?v=N1GTr-27Ah8
4:02
You will hear a THUMP sound when the photo gets stamped.
And the clipping example.
http://www.youtube.com/watch?v=HV8VvLRV3fA
Wing Commander intro sequence. 01:37
On non-MT-32 (Old) units in Heart of China the sound will be different and inconsistent. And in Wing Commander the final fireworks explosion will clip.
And if you want a game that has extra sound effects on LAPC-I and CM modules try The Lure of Temptress or Ultima Underworld. Also Monkey Island 2 the spitting sounds and the chef cooking sound are richer on these units compared to the MT-32.
These 33 sound effects simply don't exist on (any) MT-32 and no sound will play.