Problems getting interrupts to work as I expect them too

Hi, thanks for replying. I was fumbling with my iPhone and accidentally published this. This was to have been my first post. I solved this issue last night.
Now all I have to do is use one of the analog inputs so I can pick off a trigger at a lower voltage level. (I was using D2 as an input PULLDOWN) .
Now it works well, but won’t have such a nice trigger comming in as the signal generator gives me.
Thanks for answering so quickly.

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