Apple Logic Express 9 - Manual (Page 635)

Tip: Two-bar MIDI regions work particularly well as models for this function, but you can
use MIDI regions of any length. Make sure that the source MIDI region actually contains
a note at every desired quantization value.
2 Open the Quantize pop-up menu in the Inspector’s Region Parameter box, and choose
a quantization value.
3 Open the Quantize pop-up menu again, and choose Make Groove Template (or use the
corresponding key command).
The groove template, with the default name of the selected region, appears near the
bottom of the Quantize pop-up menu, and the Quantize parameter of the parent region
is set to it.
This function transforms the exact timing of transient markers or notes in the selected
audio or MIDI region into a groove template that can be accessed, and used, like any
value in the Quantize pop-up menu.
635 Chapter 21 Quantizing Audio and MIDI