DualEyes is a standalone application for use with dual systems: video from DSLR camera, audio from a separate recorder...
PluralEyes is a plugin and can sync many tracks/cameras

Glad to hear it.
Thank you.
WSS

You might find this review of Dual Eyes interesting:

http://www.productionapprentice.com/articles/product-reviews/singular-software-dualeyes-review/

OK, I am already a Plural Eyes user but today was my first try with the demo of Dual Eyes. Holy smokes! I need this as well.

Here is the difference:

Plural Eyes runs from within Vegas. It is the perfect tool if you want to sync camera clips and audio files from within Vegas.

Dual Eyes is a separate program. It process your audio recordings and video recordings and spits out wav files that exactly match your video clips and new video clips that are a mixture of the video from the video clips combined with the audio from the audio files. That is where Dual Eyes gets really cool. You get these new clips with no change in the video compression but the audio has been replaced! This is way cool in that now you can archive video clips with really good audio. Yes you could do this in Vegas, but you would have to rerender the clips, and then you would end up with larger files in an intermediate format.

Thus, Dual Eyes isn't so good for things like syncing multiple cameras to an audio track like you would do in a music video, but it is a better option (IMHO at least) for interviews which were recorded with audio on a separate recorders. This is a much better solution for something like documentary interviews where you would want to keep the compact video compression of the cameras, yet don't want to be archiving separate audio files.

The demo works for a month, but I am pretty sure I'm going to license this one as well. It will be VERY useful in my particular work flow.

Here's another cool thing with Dual Eyes. I just was testing this on my sister-in-law's wedding footage. In this particular case, I had my Nikon DSLR and two Zoom audio recorders: one in the pagoda where the vows were being exchanged, and one in front of the violinist. At the end what I had in the clip directory are all the original video clips, and then I have two copies of all the clips where the audio from the separate recorders lined up. One of these is from the audio POV of the vows audio recorder, and the other on each of these is from the audio POV of the violinist audio recorder. These are all labeled so that when you look at the directory, you have all the clips, but then on the clips where there was also audio, you have the two alternate audio versions nicely labeled. There was also wav files that corresponded to these clips which I deleted. The video on the original clips and those with replaced audio looks exactly the same but the files are ever so slightly larger. Now I can go through the clips and delete the originals of the ones that now have copies with better audio, and from the two new choices I can select the one that is better (the music one where there is nobody talking, or the pagoda one where there is). I can hardly express how cool this all is!

I just wanted to follow up on this. I registered Dual Eyes after the trial period was up because I find it more practical than Plural Eyes for dual system audio.

The big thing is that I can generate clips with the original video compression and small size but with the audio replaced with what was recorded on the separate audio recorder. I can even fix the audio up a little before I merge it with the video clips. This is so much easier in practice than using Plural Eyes. The archives are also smaller and more straight forward.

I still use Plural Eyes for multi cameras with different angles, but that is not the bulk of what I do. Mostly it is just dual system interviews and Dual Eyes is by far the better tool for this.

A nifty little script for Vegas called dawf (http://dawf.codeplex.com/ does an automatic audio track replacement right on the timeline. It doesn't get you original video + new audio as separate files, but it does accomplish the same on the timeline. (I usually re-render captured HDV to Cineform anyway.)

$0.02,
Steve