Apple Logic Pro 9 - Manual (Page 1231)

• Playback Pre-Roll checkbox: When this option is selected, all start commands force
Logic Pro to start playback a little earlier (shifted to the left). The exact pre-roll value
depends on the current delay compensation value for plug-ins. This option ensures
that transients that fall exactly on the start position are played back correctly. If this
option is unselected, transients that fall precisely on the start position can be missed,
or seem to fade in.
• Sample Rate pop-up menu: Allows you to choose the sample rate for the project.
• Surround Format pop-up menu: Allows you to choose the surround format for the
project.
• Pan Law pop-up menu: Signals panned to the center position may sound louder than
signals panned hard left or right. The Pan Law value determines the amount of volume
reduction on signals that are panned to the center position. You can choose from the
following settings:
• 0 dB: With no change to the volume level, signals will seem louder when panned to
the center position, in comparison with extreme left or right pan positions.
• –3 dB: A full scale signal (0 dBfs) will have a level of –3 dB when panned to the center
position.
• –3 dB compensated: A full scale signal (0 dBfs) will have a level of 0 dB when panned
to the center position (or +3 dB when panned to extreme left or right positions).
• Apply Pan Law Compensation to Stereo Balancers checkbox: Applies Pan Law
compensation to Stereo Balance controls.
Note: For compatibility purposes, this checkbox is selected by default for all older
projects opened in Logic Pro 9.
1231 Chapter 43 Project Settings in Logic Pro