Hello, I'm a newbie and might be in the wrong thread pls bare with me . My church just got a data video switcher (Datavideo SE-650 switcher), it has four inputs but we use 3 cameras and 2 laptops (for easyworship) here. We used three inputs for the cameras and then connected both systems to a single system through vmix and then connected the single system to the third input on the switcher (that means we ended up using 3 systems.. 2 for easyworship, 1 for vmix). The issue we are facing right now is in overlaying. If we send a green screen background to the video switcher so as to key out the background and have our writeup at the bottom of the cameras, the video switcher changes the green screen to a black screen, with some green edges at the top making it impossible to use the chroma key effects. Also we made the main background transparent on vmix using the colour input, so that all our animated titles would show over the transparent background but we ended up getting the same black background on the switcher. Pls is there anyway to remove the black background from the the switcher? It would be really helpful to us. Note: we've tried luma and linear keys but none has been able to key out this black colour. Is there any way to have a transparent background on the switcher?
The switcher also changes the color of the animated titles from vmix to its desired color, giving us a very bad output. Pls is there anyway to resolve all these???

This is our first switcher and we've never used a switcher before, except of course vmix which we've been using for the past year. Any help will be highly appreciated.

Note: We are using a Datavideo SE-650 Switcher.