Geoff from geoffmobile.com shows how to use a Constant Power cross fade to crossfade between audio on two different tracks in Premiere Pro CS5.5, and explains the difference between a Constant Power crossfade and a linear crossfade.
The constant power crossfade is useful for connecting two audio clips which have the same level of background ambient sound in each clip. You don’t want the audio to appear to “drop out” or there to be a blip in the ambient sound, so instead of using a linear crossfade (such as through gain automation in the timeline), try using a Constant Power Crossfade on each ends of the two different tracks.
Yes, it’s possible to do a Constant Power crossfade between two different tracks, by just applying the crossfade to each track’s beginning or end. This way you can ensure your ambient sound (room tone or ambient track) doesn’t have a distracting drop out or noticeable decrease in volume at the crossfade point.
Any questions about audio crossfading in Premiere, please feel free to leave comments and I will try to help!
Filmed on a Sony Cybershot DSC-HX9V and edited with Adobe Premiere Pro CS5.5 on a Windows 7 Dell PC (Intel i7 and USB 3.0 for a faster workflow).