Apple Logic Pro 9 - Manual (Page 1247)

A further point to note is that notes can generally only be assigned to strings on which
they are actually playable (F2 can only be played on the lowest string of a guitar, so the
channel assignment is completely ignored in this case).
You can create a two-staff style that displays the MIDI region twice: once using regular
music notation, and once as tablature. The indicated split point can be ignored in this
situation. A default style for this (named Guitar Mix) is found in the Logic Pro default
project.
You cannot insert clef changes in tablature staffs. If you want to change between tablature
and regular notation in the same staff, you need to cut the MIDI region, and assign the
specific staff styles to the resulting regions.
Guitar tablature relates to a regular treble clef. If you use the octave-transposing treble
clef (Treble8) for guitar notation (as done in most guitar music), you need to set the
tablature’s Transpose parameter to +12 in the Staff Style window.
1247 Chapter 43 Project Settings in Logic Pro