Visual Productions CUECORE2 Manual page 52

Intensity The master intensity works like a theatrical 'grand master'; it
dims the output of all playbacks taking their individual
intensity setting into account.
Rate The master rate will control the play speed of all playbacks;
with taking their individual rate settings into account.
Fade The master fade time overrides the fade time of all cues. This
only applies to playbacks that have 'MFade' enabled.
Similar to some of the playback properties, the master properties are not stored
in the internal flash memory. Please refer to the discussion on page 49.
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