Apple Logic Pro 8 - Manual (Page 507)

Chapter 21 Editing Audio in the Sample Editor 507
 Rhythmic Material: Use this algorithm on rhythmic material—can be drums and
percussion, but less obviously; rhythm guitar, clavinet, and piano comp parts.
 Beats Only: This algorithm perfectly maintains the timing of percussive material. It
should be your first choice for all kinds of dry drum loops.
 Universal: This high-quality algorithm is able to handle any kind of audio material,
and is generally recommended for most time stretching tasks. The following two
algorithms can, however, deliver better results in cases where the audio material
exactly matches the outlined specifications.
 Complex: Choose this algorithm to obtain natural sounding results when time
stretching complex musical material—orchestral music or final mixes.
 Percussive: The Percussive algorithm perfectly maintains the timing of rhythmic
material, making it a good choice for drum loops and percussive, non-harmonic
signals. In comparison to the Beats Only algorithm, the Percussive algorithm is better
suited for percussive material that has been processed through a reverb (or contains
a long tail). This may also apply to percussive playing styles, such as a staccato
electric piano or clavinet parts. Beats Only may be the better alternative for dry drum
recordings.
Tempo Parameters
The Tempo section is divided into two columns. The left column (Original) displays the
current values of the selected area in the audio file. The right column (Destination) is
used to set the desired target values.
Tempo Change (%)
Determines the tempo alteration, displayed as a percentage (no original value is
shown).
Tempo
Displays the tempo in bpm (beats per minute). Ensure that you set the right length in
bars, or the correct original tempo will not be shown on the left!
Length in Samples
Displays the length of the selected area in samples.
Support of Third Party Algorithms
Logic Pro allows you to access the pitch shift and time stretch algorithms of the
following third party plug-ins in the Time and Pitch Machine:
 Serato: Pitch’n Time
 Izotope: Radius
Note: These algorithms can only be accessed in the Time and Pitch Machine if the
corresponding Audio Unit plug-ins are installed, and authorized, on your system.