Grid
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Should explain Main grid as well
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Main Page > REAPER Documentation > MIDI Editor
Here are the notation values of the grid in Reaper's midi editor as provided by forum user "malcomj"
here is what the grids look like when you set them in Reaper:
4
2
1
1/2
1/3
1/4
1/8
1/16
1/32
Main Page > REAPER Documentation > MIDI Editor