How to deal with multiple values?

[Amerlander]

I´m working with Duration and VPT and wants to set a corner pin to a specific point.
The OSC syntax is: /cornerpin/upper_left f f (x y 0.,1.)

So if I make a layer with curves it only sends one value. But I cant tell him which one it is i want to send.
Its setting the X value for the curves value and the y value to 0.
is there a way to combine two Curves like having one for the X and one for the Y? Or setting the X to something fixed (not 0) and just change the Y by the curves value?