MOTU 828es, Руководство пользователя

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M O T U A U D I O T O O L S
85
Trigger modes
The Trigger menu (Figure 10-12) provides four
modes:
Trigger indicator
The Trigger indicator (Figure 10-12) displays the
state of the trigger, and also provides a way to
manually interact with it. The Trigger indicator
always displays one of three colors:
You can also click on the Trigger indicator to force
certain actions, depending on the Trigger mode.
In Auto and Normal modes, clicking on the
Trigger indicator causes the display to run freely;
you may click & hold to force this to occur for as
long as you’d like. In Single Sweep mode, clicking
on the Trigger indicator re-arms the trigger. When
the Trigger mode is
None, clicking on the Trigger
indicator has no effect.
Measurement information
You can view detailed information about a
particular time range by using the measurement
bars (Figure 10-9).
To adjust the left and right edges of the
measurement area, click and drag the blue bars in
the graph (Figure 10-9), or click and drag the blue
numbers in the upper left or right corners. To reset
them to the default value, double-click the
numbers.
Information about the measured area is displayed
at the center of the top ruler: the duration (in
seconds and samples), the approximate frequency,
and the scientific note name. If the measured area
is long enough, the approximate beats per minute
(bpm) is displayed.
Ideas for using the Oscilloscope
The Oscilloscope can be used in many useful ways
during the routine operation of your recording
studio. Here are just a few examples.
Analyzing and comparing harmonic content
The oscilloscope lets you “see” the nature of the
harmonic profile in any audio material. You can
also view two signals side by side (in stereo mode)
to compare their profiles and, if necessary, make
adjustments to the source of each signal and view
your changes in real time.
Viewing transients such as drum hits
If you loop a snare hit or other similar transient
audio clip and feed it through the oscilloscope,
you can more or less “freeze” the transient
waveform in the oscilloscope frame. This can be
useful, for example, for viewing the results of real-
time compression that you are applying with an
effects plug-in. For example, when you are
compressing a snare hit, as you make adjustment
the compressor, you can see the transient
waveform change the next time the Oscilloscope
triggers. For compression, this can be particularly
Trigger mode What it does
None The Trigger is not active; this is the default mode.
The incoming audio signal will be displayed
continuously as audio is received.
Auto The display is always updating, but when the
condition is met, the trigger event will be displayed
centered around the line marking time equals zero.
Normal The display updates only when the condition is met;
the last trace will be displayed until the next
matching event is found.
Single Sweep Similar to Normal mode, but the last trace will be
displayed until you manually arm the trigger by
clicking the Trigger indicator (Figure 10-12 on
page 84) or by pressing the space bar.
Color Status
Green When the current Trigger criteria has been met (including
when the Trigger mode is
None ).
Yellow When the Trigger is armed, but has not yet found an event
which matches its criteria. Yellow can also indicate that the
graph has been manually paused using the Pause button in
the View section (see “Pausing the display” on page 83).
Red When the Trigger is being held off, either because the
Trigger mode is set to Single Sweep or the Holdoff time is
not set to zero.