Other Plug-Ins : Other AudioSuite Plug-In Utilities : Invert

Invert
The Invert plug-in reverses the polarity of selected audio. Positive sample amplitude values are made negative, and all negative amplitudes are made positive.
This process is useful for altering the phase or polarity relationship of tracks. The Invert plug-in is useful during mixing for modifying frequency response between source tracks recorded with multiple microphones. You can also use it to correct audio recorded out of phase with an incorrectly wired cable.
 
To invert the phase an audio clip (or selection):
1 Select the clip whose phase you want to invert.
2 Choose AudioSuite > Other > Invert.
3 Ensure that Use In Playlist is enabled.
4 Click Render.