My SCD is modified for component, but the picture is light in sections and the image doesn't show if I pass it through a switch box. With that in mind, when it's hooked to a SuperGrafx, only the v1 TED works.
Something else you should know is that you will need both power supplies if running a SGX + SCD, but there is a custom pass through power cable you can buy online, so that you only need the SCD plugged in.