If you don't have the preset. Just invert (flip phase) on one of the channels (i.e. Left or Right). Since vocals are predominately panned dead center, the phase flip on one channel should cancel it out. Like Blue Bear mentioned in the other thread, anything else panned dead center (snare bass, kick, etc) will be affected too. http://www.soundonsound.com/sos/sep04/articles/qa0904-7.htm