Motion 5 - Audio

Audio Graph:

A graph displaying a visual representation of the Source Audio data analyzed

by the behavior per frame.

During playback initiated by the Play button beneath the Audio Graph, the selected
Source Audio data appears. If audio analysis is being performed, a progress bar appears
in the Audio Graph area.

The values of Low Frequency, High Frequency, Floor, and Ceiling can be set by dragging
the small triangles along the bottom or right side of the graph. Or they can be set
numerically using the four sliders underneath the graph to isolate specific frequencies
and values for analysis.

Low Frequency:

Sets the low frequency threshold of audio analysis. Only audio frequencies

above this value are analyzed. Values range from 1 Hz to 22,050 Hz.

High Frequency:

Sets the high frequency threshold of audio analysis. Only audio

frequencies below this value are analyzed. Values range from 1 Hz to 22,050 Hz.

Floor:

Sets the minimum value of audio input, below which results are ignored. Values

range from 0 to 1.

Ceiling:

Sets the maximum value of audio input, above which results are ignored. Values

range from 0 to 1.

Smoothness:

Sets the window size to smooth the result curve. Any value other than 0

triggers a keyframe reduction with an error tolerance of 1%. Values range from 0 to 10.
This parameter is only available if Respond To is set to Amplitude.

Note: Depending on your audio file, Smoothness values greater than 7 may result in
audio playing out of sync.

Sensitivity:

Sets the sensitivity of the transient detection. Values range from 0% to 100%.

This parameter is only available if Respond To is set to Transients.

Channel:

Sets the audio channel to analyze. Value can be set to Mix/Mono, Left, or Right.

Note: With a multichannel audio file used as a source, Mix/Mono must be selected for
audio analysis to be performed properly.

Peaks:

Sets the way the key points are linked when drawing the peak curves generated

by the audio analysis. Value can be set to Sharp, Smooth, Square, or Continuous.

The different peak types are described in the list below.

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Note: The examples below are for reference only. Because the audio behavior does not
generate keyframes, you won’t see keyframes in the Keyframe Editor.

• Sharp: Each peak of the animation curve is described by three keyframes with a straight

line drawn between them. A selected keyframe has no tangent handles.

• Smooth: Each peak of the animation curve is drawn by a single keyframe with a Bezier

curve. A selected keyframe has a tangent handle to change the shape of the curve.

• Square: Each peak of the animation curve is drawn by four keyframes. A selected

keyframe has no tangent handles.

• Continuous: The animation curve behaves like Smooth interpolation, but without access

to Bezier handles, because they are calculated automatically from peak to peak.

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Attack:

The animation curve shows the amount of the offset in frames between the first

keyframe of the curve and the peak of the curve generated by the Audio behavior. The
number of frames that the curve takes to reach its peak from its initial value is called the
Attack. This parameter is only available if Respond To is set to Transients.

Attack side of the curve

Release:

The animation curve shows the amount of the offset in frames between the

peak of the curve generated by the Audio behavior and the last keyframe of the curve.
The number of frames that the curve takes to reach its final value from its peak is called
the Release. This parameter is only available if Respond To is set to Transient.

Apply Mode:

Sets the method by which the audio analysis affects the curve. Value can

be set to Add, Subtract, Multiply, or Add and Subtract.

Delay:

Sets a delay in frames to offset the resulting keyframes.

Scale:

Sets the scale factor to affect the result of the audio analysis.

Apply To:

Sets the object parameter to which the audio behavior is applied.

HUD Controls
The HUD contains the Source Audio, Respond To, Graph Range, Audio Graph, Scale, and
Apply To controls.

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