Getting rid of room noise...

[bennychico11]

If this is true, then why cant you just dup the shotgun track and pan HL and HR and let it cancel itself out.....??? Dont reverse the phase on it like you would with a M-S setup....

however, this isn't true
A shotgun has a lobe in the back, but it wouldn't considered a figure eight patter. Take a look at a general Sennheiser shotgun polar pattern...



The mic has has to pick up the source signal equally to canel out. Which, with a shotgun mic pointed at someone, isn't going to happen. Besides, panning a figure eight hard left and hard right isn't going to do any canceling, like Glen said. One reason you pan hard left and hard right with M/S is because you have to reverse the polarity of one side.