Can anyone solve this Phase Locked Loop puzzle?

[Euler's_Identity]

Yep, you knew it was coming again.

If you always do what you've always done...

[Euler's_Identity]

then you'll always get what you've always got.

[Euler's_Identity]

How high does this mystery appendage go?

[Euler's_Identity]

I swear this is Multisim to the "T".

And, just like I finally do with Multisim, I just quit.

All I can say is something in the software is attaching numbers to the ends of the filenames, and it hinges around the phase locked loop circuit.   But I do know this is getting boring now.

So, one more time...