x_names are still ignored, but names for inputs and outputs now have connectors, so you should be able to do
connect(sys.input3name, sine.output)
for some input3name specified in u_names
x_names are still ignored, but names for inputs and outputs now have connectors, so you should be able to do
connect(sys.input3name, sine.output)
for some input3name specified in u_names