Apple Motion 5.1.1 - Manual (Page 120)

Chapter 4 Preferences 120
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Loop audio while scrubbing: A checkbox that, when selected, sets the audio for the frames
where you drag the playhead to repeat. When this checkbox is deselected, the audio for those
frames plays only once.
Keyframing
These controls lock keyframes in time and to enable sub-frame keyframing.
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Lock keyframes in time in Keyframe Editor: A checkbox that, when selected, sets the values
of keyframes in the Keyframe Editor, but prevents you from moving the keyframes
forward or back in time. This helps prevent changing your animation timing as you adjust
parameter values.
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Allow sub-frame keyframing: A checkbox option that ensures smoother animations when
recording during playback or when scaling a group of keyframes in the Keyframe Editor using
the Transform Keyframes tool.
Cache pane
The Cache pane of the Preferences window contains settings to manage the memory and disk
usage for projects. There are three categories of controls: Memory & Cache, Autosave, and Optical
Flow Retiming.
Memory & Cache
This setting in the Cache pane of the Motion Preferences window lets you specify how much
memory is allocated to the project cache.
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Project Cache: A value field that specifies the percentage of your total system memory to use
for the project cache. Enter a larger number to make more memory available to Motion to
cache frames, to ensure consistently smooth playback.
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