System information
Mode
Track 
Icon
Description
Write (Latch) The envelope/keyframe value is applied during  playback, and the 
control follows the envelope/keyframe settings during  playback and 
when you position the cursor.
Envelope points or keyframes are created when  you change a control 
setting, and recording continues until you stop playback.  When you 
stop adjusting the control, the control's last setting overwrites  the 
existing envelope points/keyframes.
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