Win 10, Fin 26 Academic, JABB 3
Top pic: Open Hi-Hat MIDI note number is 46. (From my pc, Score Mgr / Brush Drum Kit / Settings / Edit / Percussion Layout Designer... I've tweaked it some; it used to have a dashed line meaning "no sound". At least I got a number to show up! But its sound is a Bongo Drum or something.)
Bottom pic: Open Hi-Hat MIDI note number is 45. (From Finale Online User Manual / Percussion MIDI Maps: Garritan Instruments for Finale)
Which is it? Is it programmable?
Imagine my surprise when using JABB to write a big band part, only to realize that there is only one Hi-Hat sound: the Closed Hi-Hat. The brass sounds are great, the saxes are incredible! So, I assume it's something that can be addressed.