Apple Logic Pro 7 User Manual download pdf (Page 409)

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Chapter 11 Sample Editor 409

Parameters

Alongside Swing, you can set the percentage for the swing factor. At 50% there is no

change—you normally get the best results around 55% to 65%.

The Based On Period parameter determines whether the audio material should be

edited on the basis of eighth note, or sixteenth note swing, in the Groove Machine.

The Down Beat Level and Off Beat Level parameters 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).

The Corresponds to Tempo parameter automatically transfers Logic’s current tempo to

the Groove Machine.

The length or tempo of the selected audio material must be defined, or the Groove

Machine won’t work accurately. The length can be defined in musical values (bars,

beats, divisions, and ticks) via to Bar Length, or you can set the tempo directly by using

corresponds with Tempo.

Audio Energizer

The purpose of the Audio Energizer is to increase the perceived volume of audio

material, while altering the sound as little as possible, and without causing clipping.

Digital distortion (which would be the inevitable result of simply increasing the level,

and which sounds very unpleasant) is avoided by using this algorithm.

You could compare the effect to that of an analog tape which is saturated by a high

recording level. The distortion factor and effect on the audio material is much lower,

however.

Here’s an example of the effect. If a normalized audio file (audio data which is already

at the maximum dynamic range) is edited, the effect is as follows: a VU meter will

show a higher level, indicating increased average energy in the signal. A peak display

will show the same level as before, as the maximum signal level has not been

exceeded.

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Apple Logic Pro 7 User Manual Page 409

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