Sony's Vegas Movie Studio is an inexpensive program that lets you separate the video from the audio. You can then import the audio to Sonar, do what you need to do, and reimport it back to Vegas, which will then line it back up to the video. Vegas also does a number of conversions--for example, you can save the video in a lower resolution to allow it to work faster with Sonar, then open it back up in Vegas and take the edited audio and link it back with the original video. It's a work around, to be sure, but I've had decent luck with it, and I'm using an old version of Vegas. Vegas comes in a pro version ($600) and a home studio version, which currently goes by the name Movie Studio Platinum 12, starting at about $95. I've got Vegas Home Studio 9, which is a predecessor version.