@EmuIt was in the new Beta 1.2.182 thread
http://www.istripper.com/forum/thread/37594/1?post=552124
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The down arrow works like mouses right click ie: ~ it does not retain the model
The right arrow ( new model same scene) only works for a limited time at the start of a clip.
It is GREAT for browsing through models when editing a scene specific to certain artists and
don't want to break to the GUI or have to make an extra .scn copy & set up a model Next list
for using right click.
The best thing is,
when you are playing from the GUI red start button say, a single .scn you have made
you can seamlessly find a suitable model to watch it by initial successive right arrow key strokes.
You just have to remember to do it early into the clip. Its a tad unstable yet. However you do get to shuffle
through about 3 or 4 models seamlessly before the scene gives up & restarts.