KOna 3 is an awesome down convert. You need to use the Kona control panel.
THis is a quote from another thread in the Kona forum that I wrote on 10/20/06
[JeremyG] “Leave FCP in the HD easy setup. Using the Kona control panel, you can put a down-convert on any output of the kona card at any time. In the control panel select the format tab and change your secondary format to whatever SD standard you are in (525i or 625i). Your primary format should still be whatever HD mode FCP is in. Then select the analog or digital output by clicking it’s icon on the right side of the Control Panel. Change the format from primary to secondary and then you should see a little down-convert icon pop up on the analog pipe.
It’s a few clicks of a button.”
Jeremy