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XMP passes now:

12. tremor effect (exactly the same as impulse tracker)
13. old tremor effect (exactly the same as impulse tracker)
15. retrigger
16. global volume
17. pattern row delay: works until loop, then it breaks
19. random waveform: passes, but different from impulse tracker; not sure if that's because of the RNG or what
21. pitch slide limits
23. portamento withno note
24. short envelope loops
25. portamento and pitch slide