Apple Logic Pro 7 - Manual (Page 379)

Chapter 10 Audio Drivers 379
Recording Delay
This parameter is measured in samples. It allows the recording of Audio Regions to be
delayed by a certain fixed value. It helps advanced users to compensate for any
incorrect delay information that might be caused by the audio driver. You should not
normally need to touch this parameter.
Max. Number of Audiotracks
The Audio Engine requires free system memory, which is not assigned to Logic or any
other application. The amount of memory required depends on the maximum number
of tracks to be played, and on the number of I/O channels supplied by the driver. This
setting allows you to reduce the amount of memory required by the driver, by reducing
the number of tracks. This may be useful when you want to run other applications or
drivers simultaneously.
64 Busses
This checkbox allows the use of up to 64 Bus Objects. Logic normally restricts the
number of Busses to 32, but if you need to create more, check this box, and add the
desired Audio Objects.
Universal Track Mode
Universal Track Mode, when engaged, allows you to play back adjacent stereo and
mono Regions on a single track. Even-numbered Audio Objects won’t be regarded as
the right channels of the odd-numbered stereo Audio Objects to their left, and every
Audio Object has its own mono/stereo switch. Dependent on whether a mono or
stereo Region is played back, the pan knob will behave as a Balance or Pan control. If
you play back a mono Region and the pan is set to the center position, both channels
of the Audio Object will output the same signal level. Please note that the Universal
Track Mode has limited routing capabilities, as it is not possible to handle the left and
right audio channel separately.
The non Universal Track Mode (UTM disabled) is useful if you wish to play different
mono files for the left and right mono channels of one Audio Object, even when it is
assigned as a stereo track. An inserted stereo/stereo plug-in on this stereo track
receives different signals for the left and right channels.
Note: In order to change tracks to or from DAE/TDM, Universal Track Mode should
always be switched off, and you should only work with split stereo or mono files. Also
be aware that DAE/TDM does not currently work with interleaved stereo files. If your
tracks need to be switched between DAE/TDM and other systems, split stereo files
should be used. To do so, enable the Audio > Audio Preferences > Global > Force convert
interleaved into split stereo file(s) option.