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I'm asking questions when something is unclear to me.
Ok, I investigated it by myself. JL, by mistake or deliberately, did use F20 command at module position 30 / pattern 23 / row 37 (and at some later points) which causes unwanted slowdown. Fixed version brings the change of F20 to F1F. VBLANK mode ignores that command and plays at 125 BPM all the time.
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