User guide

Chapter 19 Quantizing MIDI Events 487
Creating an Audio to MIDI Groove Template
You can create MIDI groove templates from digital audio material. This allows you to
extract the feel from drum loops or rhythmic samples (Apple Loops are the obvious
example), and use the resulting groove template to quantize MIDI regions.
Note: You should switch off the Edit > Search Zero Crossings option in the Sample
Editor window menu.
To extract a MIDI groove template from a one bar drum loop:
1 Add the drum loop audio region to the Arrange area using any of the methods
discussed in Chapter 11, “Adding Pre-Recorded Media,” on page 265.
2 Double-click on the region to open the Sample Editor, or select the Sample Editor tab
at the bottom of the Arrange window.
3 Choose Factory > Audio to MIDI Groove Template (default key command: Control-M).
4 Choose the desired settings in the Audio to MIDI Groove Template tab:
 Preset menu: This menu contains various presets for the Audio to MIDI parameters,
which are suited to specific types of audio material. You can use these presets as
starting points for your own processing.
 Granulation (ms): Use Granulation to determine the time span of louder components
in the audio material. Logic Express uses these peak signals (or transients) to derive
information for velocity points in the groove template. The most useful values are
usually between 50 and 200 milliseconds, depending on the tempo of the audio
material.