That teaches me, never post before going to sleep…
ok so you want to do 12 over 16…
1.5/2 = 0.75
Use 1.5 multiplier and play every second note.
If you need something special (a twelve step line) you’ll need to chain two tracks and mute the last 8 steps.
Anyway, I will go to sleep soon after this but that seems to work (if I understood what you’re after).