Logic Pro 9 User Manual - Help Library - Apple

You can, of course, record events with a MIDI keyboard, and then refine your performances
in the Hyper Editor.
Changing the Grid and Beam Display
The Grid parameter in the Event Definition Parameter box of the Inspector is important
when creating events in the Hyper Editor. Newly created events are automatically added
at grid positions. This makes it easy to create a drum pattern, with 4 divisions on one
lane, 8 divisions on another lane, and 16 divisions on another lane; assigned to kick, snare,
and hi-hat sounds, for example.
To define the Grid value for the selected event definition lane
µ Choose a grid type from the Grid pop-up menu in the Event Definition Parameter box.
Any events that you add snap automatically to the nearest grid position. The positions
of existing events are not affected.
Tip: When editing or constructing complex rhythm patterns, it can be useful to create
several event definitions (see Selecting and Creating Event Definitions) for one drum
note, each with a different quantization grid. For example, if there are two lanes for a
snare drum, one with a 1/16th and the other with a 1/96th grid, you can use the Pencil
tool to add individual hits in the coarser grid, and drum rolls in the finer grid.
When defining the Grid parameter to add a succession of controllers, use the motto, “as
coarse as possible, and as fine as necessary” to minimize data output. Logic Pro can handle
very large amounts of data, but unfortunately the same cannot be said of MIDI.
682 Chapter 24 Editing MIDI in the Hyper Editor