This command lets you establish the units of measurement you want to use while creating a graphic shape in the Shape Designer. It also lets you specify how frequently you want grid points to appear (when Grid is selected in the Show submenu of the Shape Designer menu).
When this visual background grid is visible, you can use it for helping you draw straight lines, or for gauging the size of an object you’re manipulating. The grid doesn’t appear in printouts, and lines you draw don’t "snap to" it; it’s purely an on-screen visual aid.
If you’re designing an Executable Shape, the imaginary horizontal gridlines don’t represent a unit of spatial measurement. Instead, each time your Executable Shape crosses a horizontal gridline, it generates a new playback value, representing an increase or decrease in the playback variable's value (one beat per minute, one unit of MIDI velocity, and so on).
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