Apple Logic Pro 7 User Manual download pdf (Page 413)

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Chapter 11 Sample Editor 413

Parameters

The first four parameters control the analysis algorithm. They are listed in order of

importance:

Granulation (ms)

This determines the time span of louder components in the audio material, which

Logic uses 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.

Attack Range (ms)

This tells the program how long the attack phases of the sounds in the audio material

are. As an example, drum and percussion instruments have short attack times of less

than 20 ms, while string instruments have longer attack phases. The best values for

most instruments are usually between 5 and 40 ms; Many instruments are near 20 ms.

Smooth Release (%)

This parameter is specifically for processing audio material containing sounds with a

long release and/or reverb. This makes it easier to convert these sounds into

quantization points. The setting used here should generally be between 0 and 5%,

except when processing passages containing sustained, distorted guitars, or similar

sounds.

Velocity Threshold

This parameter sets the threshold level. All signals that fall below this value are ignored.

In most cases, a value of 1 is suitable, except when processing very dense, loud material

with soft background noises.

Basis Quantize

This function enables you to add artificial trigger points at positions where there are no

trigger points present. The groove templates obtained using this method are suitable

for situations where you need more quantization points than are contained in the

audio material.

The identification of trigger points in the audio material is not affected by this

parameter.

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