Setting the bounce file name and folder, Bouncing and powr dithering, Bouncing and pow-r dithering – Apple Logic Pro 8 User Manual
Page 613
Chapter 27
Bouncing Your Project
613
Setting the Bounce File Name and Folder
By default, bounce files are:
 Named after the chosen output channel strip (the Bounce button you clicked), or
Output 1-2, if the Bounce window was opened with the File > Bounce command.
 Saved in the Bounces sub-folder of the project folder, but you can choose any folder
on any Volume.
To set the bounce file name and folder:
1
Simply type the desired file name in the Save As: field to change the default file name,
and choose another folder, if you like.
2
Click the New Folder button at the lower left of the Bounce window to create a new
folder, if desired.
3
Click the Bounce (or Bounce and Burn) button.
All files (if multiple files are created) are saved in the chosen folder, and assigned the
name you entered, with appropriate file extensions: wav, aif, m4a, and so on.
Bouncing and POW-r Dithering
Logic Pro provides you with the professional POW-r dither algorithm, designed to
convert 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 can be applied when:
 Bouncing audio files to disk
 Exporting OMF files (see “
POW-r offers three distinct dithering modes.
 None 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 of the bounced file 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 the side effects caused by bit reduction. It does this by
moving the quantization noise spectrum to the frequency range above 10 kHz—the
range the human ear is least sensitive to. Technically, this process is known as spectral
displacement.