Adding a 4th AC Reference - OK to use plug #12?

I need to add a 4th AC Reference. Can I use ports like #12 or #11 and plug in a standard IotaWatt AC reference like this…

And then just configure setting the type to “VT” like this…

No, you can only connect voltage to the 5.5 mm plugs for inputs 0, 13 and 14. Connecting to any 3.5mm input will damage the unit.