Calculate coherence for a series of Impacts

Calculating coherence has been discussed several times - including this knowledge base article and community example. But I'm still missing something.
How can I calculate the coherence so it updates after each hit (right now it's always 1)?
On a related note, I'm assuming the Y signals in the FRF(Mag-Phase) are the response and the X signals are the stimulus...Transfer Function.vi explicitly states Response and Stimulus for its inputs, but FRF(Mag-Phase) doesn't.
I attached an abridged version of what I've attemped.
Andrew
Attachments:
CalcCoherences.vi ‏18 KB

Check this example:
http://zone.ni.com/devzone/cda/epd/p/id/5810
You will see that to measure coherence you need to input the same size array or waveform. In your VI, you are sending your input through a shift register and augmenting the size of your array.
National Instruments
Applications Engineer

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