2009

Table Of Contents
Grp. (Group) pop-up menus: Set group membership for each channel (A, B, C, or no
group (indicated by -). Moving the Threshold or Output Level slider for any grouped
channel will move the sliders for all channels assigned to that group.
Tip: Press Command and Option while moving the Threshold or Output Level slider
of a grouped channel to temporarily unlink the channel from the group. This allows
you to make independent threshold settings while maintaining the side-chain detection
link necessary for a stable surround image.
Byp (Bypass) buttons: Independently bypasses the corresponding channel unless
grouped. If the channel belongs to a group, all channels in the group are bypassed.
Detection pop-up menu: Determines if the Surround Compressor uses the maximum
level of each signal (Max) or the summed level of all signals (Sum) to exceed or fall
below the threshold.
If Max is chosen, and any of the surround channels exceeds or falls below the
Threshold, that channel (or grouped channels) is compressed.
If Sum is chosen, the combined level of all channels must exceed the Threshold
before compression occurs.
Surround Compressor Main Parameters
The Surround Compressors Main section provides the following parameters:
Ratio knob and field: Sets the ratio of signal reduction when the threshold is exceeded.
Knee knob and field: Determines the ratio of compression at levels close to the threshold.
Attack knob and field: Sets the amount of time it takes to reach full compression, after
the signal exceeds the threshold.
111Chapter 4 Dynamics Processors