no Composite signal FCP out to VHS

Trying to output from Final Cut to a VHS deck. I have a K-3 Box breakout box. I'm using the Composite + Y/C to go into deck with RCA adapter. The analog test bars from the AJA control panel are coming through, but when I switch over to FCP, my video is not coming through. External video is on. Video playback is set to 525i29.97 RGBA 720x486. What am I doing wrong?