With a multimeter tested the v5 204
DC passes on v hi & lo on both outputs to each other and to input at all times
With switch on h hi & lo same
With switch off h hi & lo DC pass from bottom output to input but not to other output, from side output DC blocked to both input and other output

Will I need DC blockers for the vertical feeds from the splitter to the scr multiswitch? Or is it only the horizontal feed that need blocking or do any?