MIDI : Score Editor : Grid

Grid
For more information, see the following topics:
The Grid selector lets you define the Grid value for MIDI notes inserted and displayed in the Score Editor window.
To set the Grid value for the Score Editor window:
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From the Grid Value pop-up menu, select a note value.
If you want dotted note values, also select the Dotted option.
If you want triplet note values, also select the Triplet option.