EVS IPDirector Version 6.2 - June 2013 IPEDIT User Manual - Manual (Page 129)

After an Extend Slow/Fast Action
When the user clicks the Extend Slow/Fast button , IPEdit automatically shifts the
OUT point of the clip to the position of the mark OUT point and adapts the playout speed
of the timeline element and displays it on the extended elements.
As no new material is added, the duration of the extended element is not modified.
As the user is in Overwrite mode, the duration of the next timeline element is reduced.
IPDirector - Version 6.2 - User Manual - IPEdit
6. Timeline 117