
Chapter 1 General Improvements 17
Song Settings
The song settings contain an additional Audio pane, which offers the following two
options:
Playback Pre-roll
When this option is enabled, all start commands will start playback a little earlier
(shifted to the left). The exact pre-roll value is dependent on the current delay
compensation value for plug-ins. This option ensures that transients which fall exactly
on the start position are played back correctly. If this option is disabled, transients that
fall precisely on the start position can be missed, or appear to be faded in.
Pan Law
The Pan Law value determines the amount of volume reduction to mono signals that
are panned to the center position. If set to 0 dB, mono signals will seem louder when
panned to the center position, in comparison with extreme left or right pan positions. If
set to either –3 dB or “–3 dB compensated”, mono signals will seem equal in loudness,
regardless of their pan position:
 –3 dB: A full scale mono signal (0 dBfs) will have a level of –3 dB when panned to the
center position.
 –3 dB compensated: A full scale mono 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).
Note: Songs created in older Logic versions use the 0 dB option. Be aware that
switching the Pan Law value to –3 dB will change the mix of such songs!
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