Apple Logic Pro 7 - Manual (Page 467)

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Matrix Editor
The Matrix Editor allows MIDI note events to be handled
in much the same fashion as Regions in the Arrange
window.
This editor is often called the “piano roll” editor as it represents note events as beams
that resemble the holes cut in the paper of pianola piano rolls. It is an exceptionally
easy to use tool for the creation and editing of MIDI note data.
Matrix Editor—Introduction