MOTU Audio Express User's Guide download pdf (Page 61)

CUEMIX FX

Waveform Recognition

The Waveform Recognition option searches

through new audio data looking for a waveform

which most resembles that which was previously

displayed. The region where this takes place is a

small window around the line marking time equals

zero, denoted by the extra vertical graph lines

surrounding it. There are two kinds of waveform

recognition available: Type I and Type II.

Figure 9-13: 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 Tr i g g e r (Figure 9-14) 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 9-14: Trigger settings

Criteria

The criteria check boxes (Figure 9-14) determine

the conditions that the trigger is looking for and

where it will look for them.

The Left check box causes the condition to be

looked for in the left channel of the signal; likewise,

the Right check box 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 check boxes determine the slope

of the event. When the Pos check box is enabled,

the trigger will look for an event where amplitude is

increasing; likewise, enabling the Neg check box

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 check box 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

Trigger indicator

Trigger menu

Criteria check boxes

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MOTU Audio Express User's Guide Page 61

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