Audio Render Files in Multicam Sequence Enormous. Cannot export Media.

Hello,
I am editing on a brand new 2.8 Ghz i7 Mac with 8GB Ram.
My project is 53 minutes long and made up of clips from about a dozen multicam sequences.
The client wants to see a rough cut on DVD. I figured this should be a fairly simple operation, but when I Export --> Media and select the setting for DVD, it tells me it will take over 3 hours to render audio.  So, I set it to do the task over night, but that didn't help because the render files were so huge -- 20 -30 gigs each, that they filled up my hard drive before the project finished rendering.  I don't have a spare drive with enough space for these enormous render files, though if that's the only solution I may have to get one.
I feel like there must be a simple work around? Sure, there are a lot of audio tracks in this project, but...it's hardly unusual. I did see a thread about this, but the advice was to "resample the bit rates" in another software, but I don't even know what software I could use for this.  I have hundreds of files... there must be a better way? Do I need to get a huge drive for these render files? I tried exporting an XML to FCP, but it did not work, probably because of the multicam sequences. 
Thanks. 

No idea if this will help with your problem, but there is a CS6 Issue/Bug MXF http://forums.adobe.com/thread/1074489
Also, mixing SD and HD means that something has to give... and if you want everything at SD resolution, you may want to look up "interpret footage" in the help file, to "force" the HD video into the SD screen size (note that I do not mix video types, so I really can't give detailed instructions)
Also, if you export the MXF it would need to be into an SD file, not just another HD file of a different type

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