Apple Logic Pro 9 - Manual (Page 587)

Opening the Sample Editor’s “Audio to Score”
You need to select an area within an audio file before you can open “Audio to Score.”
To open “Audio to Score”
1 Select the destination MIDI or software instrument track in the Arrange area.
The MIDI region generated by the “Audio to Score” function will be placed on this track.
2 Select the area of the audio region in the Sample Editor that you want to process through
“Audio to Score.”
3 Choose Factory > “Audio to Score” (or use the corresponding key command, default
assignment: Control-S).
587 Chapter 17 Editing Audio in the Sample Editor