10.6

Table Of Contents
898Logic Pro User Guide
Center Level slider: Drag the Center Level slider or field to set the volume relationship
of the (front) center channel—typically used for dialogue in film and TV productions.
LFE Level slider: Drag the LFE Level slider or field to control the volume of the LFE
output. The abbreviation stands for Low Frequency Enhancement or Low Frequency
Effects, as the LFE output is most commonly sent to a subwoofer channel. The use of a
subwoofer speaker is not mandatory.
Tip: If you want only low frequency signals to reach the output, insert a multi-
mono surround EQ into the surround master channel strip. Use this to set the LFE (or
subwoofer) output. A cutoff frequency of 120Hz is standard for most surround apps.
For more information, see Surround master channel strip in Logic Pro.
Separation Controls: Drag the sliders in the lower section of the Surround Panner
window to determine the amount of separation between channels. As you change these
parameters away from values of 1.00, the separation square changes (to a trapezoid or
rectangle) in the surround field, providing visual feedback on how the channel is being
affected.
Separation XF: Applies to the Left and Right (front) channels. Reducing Separation
from 1.00 down to 0.00 mixes the right signal into the left channel, and vice versa,
until both channels output a mono signal.
Separation XR: Applies to the Left and Right Surround (rear) channels. Works as
above, for the surround speakers.
Separation Y: Affects the mix relationship of the front and rear channels (in front or
behind the listening position, in other words). It mixes the Left/Left Surround and
Right/Right Surround channels. When Separation Y is set to 0.00, the front and rear
channels output in mono.
The separation square is visible if the extended parameter section is open. If the
extended parameter section is closed, it remains visible if any of the separation
values do not equal 1.00. It also stays visible when the default values are reached
by editing the square graphically. Closing the extended parameter section (with all
separation values at 100%) makes the square disappear. You can Option-click the
value field or sliders shown in the extended parameters (or on the separation square
lines) to reset them to default values.
Note: In 7.1 ITU surround formats, the Separation of Left Middle and Right Middle is
determined by the average separation value of the Front and Rear channels.
Level Compensation pop-up menu: Select the surround pan law for stereo to surround
and mono to surround channels.
Note: These options only appear in projects that were mixed in surround and saved in
Logic Pro versions 8.x to 9.1.6.
Unity gain at speaker: The default setting for mono to surround and stereo to
surround channels. All new projects and projects imported from Logic Pro 9.1.7 or
newer follow this pan law.
A mono signal panned hard left of a stereo output with X dB gain will do the same if
panned hard left with a mono to surround panner. A stereo signal panned hard left
and right with X dB gain will do the same if panned hard left and right with a stereo
to surround panner.