I have an HD broadcast van. I send a production signal into AJA hdtv distribution amp. It then patches into black magic up cross down converter , i set it to Pal SD Letterbox. The sdi out then goes into the blackmagic deck link studio for final cut pro. I am struggling with the settings in fcp and black magic to get a SD 16x9 out onto timeline. Audio no problem, HDTV 1080i 50 no problem. Can anyone help with this.