I believe this was asked a while ago about a 500 system and there was an option to do it but I think it was removed in a later software version.I remember seeing it in the manual and saying it should not be used.
Well I searched and here it is
https://www.sundance-communications.com/forum/Forum23/HTML/000071.html

[This message has been edited by pvj (edited March 14, 2005).]