I am currently using the trial version of Vegas Pro 11. Can someone please tell me how to render an uncompreesed avi file with an alpha channel.The only options I see are the presets. Even when I click customized I see no uncompressed settings.

File - Render As then scroll down to the "Video for Windows" section and click on the preset that best matches your desired output size.

Now click on "Customize" and go down to the "video format" drop down box. In that box, choose "Uncompressed".

Finally, go to the bottom of the dialog and check the "Render AlphaChannel" box.

Thanks Ed!