[hoopti]

Set the renders on the Render tab, render button, output portion. That will allow you set how you want to output your files.

To change the number of passes, I'm not sure what you're looking for, but those usually come with more passes equal higher anti-aliasing. Those factors could be found on the camera's item properties page.

Let me know if that's not what you mean.

Hope that helps.

Hoop