History of Logic Notator 2.0
Maybe you mean: 'main slider'
In Notator, we see the core MIDI engines of Logic–a real time notation editor, an event editor, a matrix editor and hyperedit–all in a highly integrated screen layouts. Notator SL as of version 3.0 had its own multi-tasking scheme, called Softlink, which allowed for the integration of editor librarian software. Read More!!!