Is it possible to control the cursor of a XY-graph via Keyboard and read the y value of the curser x-position?

I have following problem when I control the cursor via an attribute note, it is neccersary to free the cursor, but then it is not possible to read the y-Value of the cursor position. I want to control the cursor via keyboard and buttons, but with the funtionality of attribute setting "cursor fixed to plot".

You know the X position so just read the Y value by reading it straight from the Y array instead of from a property node...
Alternatively unlock the cursor if the position control has changed...and lock it again if it is constant for n milliseconds; to produce the Y value from the Y property.
MTO

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