Apple Shake 4 - Manual (Page 277)

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Using the Audio Panel
The Audio Panel lets you import reference audio clips
that you can use for timing and to generate keyframe
data within your script.
About Audio in Shake
Shake supports the use of PCM AIFF and PCM Wave files in your projects. You can
import one or more audio files, mix them together, extract curves based on frequency,
manipulate the timing of the sound, and save the files back out again. These audio
curves can also be visualized directly within the Curve Editor.
Note: Because audio playback is handled through the use of Macintosh-specific
QuickTime libraries, you can only hear audio playback (either solo, or synchronized with
your video) on Mac OS X systems. You can still analyze and visualize audio in Linux.
Although Shake supports a variety of frequencies and bit depths, playback is always 16-
bit, defaulting to a sample rate of 44.1 kHz (the playback sample rate can be changed
via the Playback Rate parameter). Independently of playback, audio is always exported
at the highest quality specified in the Mixdown Options, corresponding to a 27-point
symmetric Kaiser-windowed sinc interpolation.
Audio and QuickTime
When you read in a QuickTime file via a FileIn node, the audio is not automatically
imported into your project. Instead, the audio must be imported in a separate
process using the Audio Panel, just like any other audio file in Shake. This means that
you’ll be reading in the same file twice, once via a FileIn node, and a second time
using the Open Audio File button in the Audio Panel.