Apple Logic Pro 7 User Manual download pdf (Page 647)

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Chapter 21 Song Settings and Preferences 647

Audio Preferences: MP3

Bit Rate (Mono/Stereo)

The bit rates are selectable between 8 kbps and 320 kbps, but default to 80 kbps mono,

and 160 kbps stereo. These rates offer acceptable quality and good file compression. If

you can afford the extra file size, we recommend selecting 96 kbps for mono and

192 kbps for stereo streams for better audio quality. You can, of course, choose even

higher rates, but the quality improvement in bit rates above 96/192 kbps is minimal.

Use Variable Bit Rate Encoding (VBR)

Variable Bit Rate encoding compresses simpler passages more heavily than more

harmonically rich passages, generally resulting in better quality MP3s. Unfortunately,

not all MP3 players can accurately decode VBR-encoded MP3s, which is why this option

is off by default. If you determine that the listener/s of your MP3 can decode VBR-

encoded MP3s, you can switch this option on.

Quality

Keep this set to Highest whenever possible. Reducing the quality will speed up the

conversion process, but at the expense of audio quality.

Use Best Encoding

Again, like the Quality parameter, if you uncheck this option, you will gain encoding

speed at the price of audio quality. This should always be kept on unless conversion

time is an issue.

Filter Frequencies Below 10 Hz

When this option is checked, frequencies below 10 Hz (which are usually not

reproduced by speakers, and are not audible to human ears at any rate) will be

removed, leaving slightly more data bandwidth for the frequencies which we can hear,

resulting in an improvement in perceived quality. Only uncheck this if you’re

experimenting with subsonic test tones, or exporting MP3s for whales…

Stereo Mode

You can select joint stereo or normal stereo mode. Depending on the original file, these

settings may (or may not) offer any audible difference. Experiment with both settings

to determine your preference.

Audio Preferences: Reset

Send Reset Messages to Audio Instruments:

Reset messages of the specified type (Control 64 off (Sustain), Control 1 (Modulation) to

zero and Pitch Bend to center position) are sent to all active Audio Instrument channels

for each of the checkboxes. This may be useful if you are encountering hung notes, or

are finding that controller settings are incorrect when in Cycle mode or when returning

to the beginning of a section or the Song start point.

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Apple Logic Pro 7 User Manual Page 647

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