but does not export AAF and EDL files
Sony Vegas Pro 12 does! Just saying in case you don't know.
DNxHD Codecs download can be found at: http://avid.force.com/pkb/articles/en_US/Download/en423319
You will find a nice tutorial for making render templates in Sony Vegas here: http://johnrofrano.com/training/video-tutorials/avid-dnxhd-template-for-vegas-pro/
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