MOTU MicroBook II, Руководство пользователя

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M A C O S X A U D I O S O F T W A R E 31
Lower latency versus higher CPU
overhead
The buffer setting has a large impact on
the following things:
■
Patch thru latency
■
The load on your computer’s CPU
■
Possible distortion at the smallest
settings
■
How responsive the transport controls
are in your host audio software
The buffer setting presents you with a
trade-off between the processing power
of your computer and the delay of live
audio as it is being patched through your
software. If you reduce the size, you
reduce patch thru latency, but may
significantly increase the overall
processing load on your computer,
leaving less CPU bandwidth for things
like real-time effects processing. On the
other hand, if you increase the buffer size,
you reduce the load on your computer,
freeing up bandwidth for effects, mixing
and other real-time operations.
Figure 5-16: When adjusting the buffer size
to reduce monitoring latency, watch the
‘processor’ meter in Digital Performer or
AudioDesk’s Performance Monitor. If you
hear distortion, or if the Performance meter
is peaking, try raising the buffer size.
If you are at a point in your recording
project where you are not currently
working with live, patched-thru material
(e.g. you’re not recording vocals), or if
you have a way of externally processing
inputs, choose a higher buffer size.
Depending on your computer’s CPU
speed, you might find that settings in the
middle work best (256 to 1024).
Transport responsiveness
Buffer size also impacts how quickly your
audio software will respond when you
begin playback, although not by amounts
that are very noticeable. Lowering the
buffer size will make your software
respond faster; raising the buffer size will
make it a little bit slower, but barely
enough to notice.
Effects processing and automated
mixing
Reducing latency with the buffer size
setting has another benefit: it lets you
route live inputs through the real-time
effects processing and mix automation of
your audio software.
CUEMIX FX HARDWARE
MONITORING
The MicroBook has a more direct
method of patching audio through the
system. This method employs the
MicroBook’s
CueMix FX
digital mixer.
When enabled, CueMix FX activates
hardware patch-thru in the MicroBook
itself. CueMix FX has two important
benefits: