Apple Logic Pro 7 - Manual (Page 304)

304 Chapter 6 Logic’s Mixing Facilities
The Aux Object features the following elements (see “Bus Objects” on
page 302): Inserts, Sends, Input, Output, Grouping, Automation, Pan, Level, and Level
meter, Mute, Stereo/Mono.
Aux Objects as Bus returns
By definition, Sends (which are, in effect, the busses) are not available directly on Bus
channels. Busses can, however, be set as the Input source for Aux channels. In doing so,
the Aux channels act as bus returns, allowing the use of Sends. These Sends can be
returned on additional Aux channels allowing the construction of complex effect
routings. (In most cases, you won’t want to monitor the signal twice, so set the
respective bus output assignments to “No Output”.)
Aux Objects and Software Instruments with multiple outputs
By default, all outputs of a Multi Channel (see “Audio Instrument Object” on page 298)
Instrument plug-in are routed to the main output pair of the respective Audio
Instrument Object. Subsequent Multi Channel Instrument outputs are sent to Aux
Objects.
Master Object
The master fader changes all output gains. It acts as a separate attenuator stage; the
level relationships between the Output Objects are not affected. This is very helpful as
a proportional output volume control and is particularly useful for surround mode in
Logic (fades of the complete surround mix).
In some cases, you might wish to prevent individual Output Objects from being
controlled by the Master Object—outputs used as effect sends to external hardware
devices, for example. Simply switch such Output Objects to Solo Safe mode by Control-
clicking their Solo button, and they won’t be controlled by the Master Object.