Logic Pro 9 User Manual - Help Library - Apple

• Granulation (ms): Determines the time span of louder components in the audio material.
Logic Pro 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 ms,
depending on the tempo of the audio material.
• Attack Range (ms): Tells Logic Pro how long the attack phases of the sounds in the
audio material are. For example, drum and percussion instruments have short attack
times of less than 20 ms, whereas string instruments have longer attack phases. The
best values for the majority of instruments are usually between 5 and 40 ms, with most
around 20 ms.
• Smooth Release (%): Specifically designed to process audio material that contains sounds
with a long release or reverb tail. This makes it easier to convert these sounds into
suitable quantization points. The value you choose here should generally be between
0% and 5%, except when you are processing passages that contain sustained notes,
distorted guitars, or similar sounds.
• Velocity Threshold: Sets the threshold level. All signals that fall below this value are
ignored. In most cases, you should choose a value of 1, except when you are processing
very dense, loud material with soft background noises.
• Basis Quantize pop-up menu: Enables you to add artificial trigger points at positions
where there are no trigger points present. Groove templates created with this method
are suitable in situations where you need more quantization points than are contained
in the audio material. The automatic identification of trigger points in the audio material
is not affected by this parameter.
• Time Correction: Allows you to compensate for any time delays that may occur when
external samplers or synthesizers are triggered by MIDI notes. These time delays are
sometimes very noticeable, particularly if the connected device is playing a MIDI region
(that was quantized with an audio-to-MIDI groove template) at the same time as the
original audio material. You should be able to compensate for this effect by using
settings between −20 ms and 0 ms.
644 Chapter 21 Quantizing Audio and MIDI