MOTU 828x 28x30 Audio Interface with ThunderTechnology - Manual (Page 100)

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zero, denoted by the extra vertical graph lines
surrounding it. There are two kinds of waveform
recognition available: Type I and Type II.
Figure 9-39: Waveform Recognition menu
Type I recognition provides the most stable display
of the waveform. It is the most resistant to change.
Louder transients, such as those produced by a
snare drum, are not displayed inside of the
waveform window. Type I is best for observing the
shape of a signal produced by a synthesizer or
observing the tone of a guitar through a chain of
pedals.
Type II recognition is less resistant to change. It will
include loud transients within the waveform
recognition window. Type II is better for observing
percussive music where the beat itself is to be
centered within the waveform window.
Trigger
When the Trigger (Figure 9-40) is not enabled (the
Trigger menu is set to None ), the graph updates
based on time: after every n samples of the
monitored audio signal, the most recent samples
are displayed. When the Trigger is enabled (set to
any mode other than
None ), the graph updates in
response to specific conditions in the signal. The
Trigger section defines that criteria and how the
graph will display the events that match.
Figure 9-40: Trigger settings
Criteria
The criteria checkboxes (Figure 9-40) determine
the conditions that the trigger is looking for and
where it will look for them.
The Left checkbox causes the condition to be
looked for in the left channel of the signal; likewise,
the
Right checkbox looks for the condition in the
right channel. One or both of these can be enabled
simultaneously. If neither is enabled, the criteria
will not be found because the trigger is not looking
at any audio signal.
The Pos and Neg checkboxes determine the slope of
the event. When the Pos checkbox is enabled, the
trigger will look for an event where amplitude is
increasing; likewise, enabling the
Neg checkbox
tells the trigger to look for an event where
amplitude is decreasing. One or both of these can
be enabled simultaneously. If neither is enabled,
the criteria will not be found because the trigger is
not looking for any particular kind of event.
The Level setting defines the amplitude threshold
that the trigger is looking for. The Level is indicated
on the graph by a blue horizontal line (or two blue
horizontal lines, if
Magnitude is enabled). Events
which cross this threshold using the enabled
slope(s) in the enabled channel(s) will activate the
trigger. The response of the trigger is set by the
Trigger mode (see “Trigger modes”, below).
Enabling the Magnitude checkbox tells the trigger
to look for both positive and negative Level values,
regardless of whether the Level value is positive or
negative. For example, if Level is set to +0.500 and
Magnitude is enabled, the trigger will look for both
+0.500 and -0.500. You will see a second blue line
appear in the display when
Magnitude is enabled to
denote the second value.
Trigger indicator
Trigger menu
Criteria check boxes