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Logic Pro 9 User Manual - Help Library - Apple

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There are a number of ways to improve the beat mapping accuracy of audio regions.<br />

When you click the Detect button in the Beat Mapping track, detected transients are<br />

displayed above a certain visibility threshold. It is possible to adjust this threshold using<br />

the − and + buttons in the Beat Mapping track.<br />

• Clicking the − button decreases the number of displayed transients.<br />

• Clicking the + button increases the number of displayed transients.<br />

A high number of transients can be useful if dealing with less distinct accents in the<br />

music—such as soft drums in a loud mix. On the other hand, such a setting might lead<br />

to the display of transients that have no meaning for the rhythmic structure of a region.<br />

In general, you should begin with a lower setting, and only switch to a higher setting if<br />

obvious rhythmic elements in the music aren’t recognized correctly.<br />

On occasion, your recordings may contain (MIDI note) events that fall onto musically<br />

useful positions, and should remain there when beat mapping is used for audio recordings.<br />

Such situations are catered for by the inclusion of the <strong>Pro</strong>tect MIDI option, found in the<br />

track header of the Beat Mapping track. Simply activate this option to keep existing MIDI<br />

events at their current Bar ruler positions when beat mapping.<br />

You can also make beat mapping easier by moving one or multiple selected audio regions,<br />

so that the first transient marker in any of the regions is located on the nearest whole<br />

beat position.<br />

To move the first transient marker in a region selection to the nearest whole beat<br />

position<br />

µ Control-click (or right-click) the beat mapping header, and choose Move Selection with<br />

First Transient to Nearest Beat from the shortcut menu (or use the corresponding key<br />

command).<br />

This moves the first transient marker in the region selection to the nearest whole beat<br />

position, with all selected regions moving with it.<br />

Automatic Beat Mapping of Regions<br />

The Beats from Region button in the Beat Mapping track header activates an automatic<br />

Beat Mapping method that uses a self-recorded metronome region.<br />

Chapter 34 Beat Mapping Regions<br />

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