When you set up the XPression machine and choose "create new parameter" for that IP and Port, that's all you really need.
Go into edit mode, click the "params" button (the counter clockwise button bellow NDI), choose "Text", drag out a field and choose the parameter name you gave to the Xpression IP from "Existing Parameter" list.
Voila! You should have a text field where you can change the target IP of the Xpression machine.Any Xpression API calls will then try to send their commands to the IP in that text field.
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