Apple Logic Pro 7 User Manual Page 84

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84 Chapter 1 Using Logic
Export > All Tracks as Audio File: This function exports all audio tracks to an audio file.
Bouncing and POW-r Dithering
Logic provides you with the leading professional POW-r dither algorithm, designed for
the conversion of 24 bit recordings to 16 bit files—as required for CD burning, for
example. POW-r (Psychoacoustically Optimized Wordlength Reduction) is licensed from
the development team of the POW-r Consortium LLC.
POW-r dithering is applied when:
bouncing audio files to disk
exporting OMF files (see “OMF Export/Import on page 80)
Bouncing can be performed directly in the Arrange (and other) windows by selecting
the File > Bounce menu option, which will launch the Bounce dialog. Bouncing can also
be initiated by clicking on the Bounce button found on Audio Output Objects (see
“Bounce” on page 285).
POW-r offers three distinct dithering modes.
No Dithering: No dithering is applied.
POW-r #1: uses a special dithering curve to minimize quantization noise.
POW-r #2: (Noise Shaping): uses additional noise shaping over a wide frequency
range, which can extend the dynamic range by 5 to 10 dB.
POW-r #3: (Noise Shaping): uses additional, optimized noise shaping which can
extend the dynamic range by 20 dB within the 2 to 4 kHz range—the range the
human ear is most sensitive to.
Note: Noise Shaping minimizes side effects caused by bit reduction through spectral
displacement of quantization noise above 10 kHz—the range the human ear is least
sensitive to.
The mode which will sound the best to you is primarily dependent on the program
material and on your personal taste. The “right setting is best determined by
auditioning the audio material with each of the dithering modes.
Important: Dithering the same audio signal multiple times should be avoided.
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