Apple Logic Express 8 - Manual (Page 539)

Chapter 21 Editing Audio in the Sample Editor 539
Using the Groove Machine
You can use the Groove Machine to alter the feel, swing, or groove of digital audio
material, in percentage steps. Put another way, the Groove Machine can quantize
straight audio!
You can also strictly quantize audio that “grooves a little too much” with the Quantize
Engine (see “
Using the Quantize Engine ” on page 547).
Important: Before you open the Groove Machine, make sure that the tempo of
Logic Express exactly matches that of the selected audio material, or the Groove
Machine won’t work accurately. You can, however, set the tempo and length directly in
the Groove Machine, using the Corresponds with Tempo and To Bar Length parameters.
To open the Groove Machine, do one of the following:
m Choose Factory > Groove Machine in the Sample Editor (or use the corresponding key
command).
m Click the Groove Machine tab if another Digital Factory processor is visible.
Swing
This parameter is used to set the swing factor. At 50% there is no change—you will
generally achieve the best results with values around 55% to 65%.
Based on Period
You can determine whether the audio material should be edited (quantized) on the
basis of eighth note, or sixteenth note swing.
Down Beat Level and Off Beat Level
You use this parameter to determine whether the down beats (or off beats) in the
audio material should be raised or lowered. Positive values increase the level, negative
values reduce the level. Bear in mind that raising the level of normalized audio material
can cause distortions (particularly on the down beats, which are usually louder).