Out of phase stereo audio effect

Audio effects

Out of phase stereo

An effect known as OOPS (Out Of Phase Stereo) can be used to remove the "center" channel to hear details off to the sides. By taking the left and right signals from a stereo source and adding them, you get an ordinary mono signal.

However, if you invert the polarity of one channel, and then add the channels back together, you have an OOPS'd signal. It means that any material in the center of the stereo image will cancel out, and any material that has been panned left and right will still be present.

The example

This video clip has been done using OOPS in order to enhance the backing group vocals. The remix was made combining OOPS mono tracks with left panned original track.