(Request) Judgement Day FFVII over Final Dungeon FFVI

I deleted %v32|16 from Track 1 and then it let me import it, but the song is distorted when I load it. How do I know where to fix it?

This is normal since you are using a "|" symbol instead of the letter "L" in minuscule ("l"). This is why it wasn't letting you import the MML file.

Also, I tried using the sample MML in the tutorial on here. Is that actually a good one?

If you're talking about the RS3 one, it would most likely not work because it uses drum tracks. I don't know about the Mario 3 one.