Beginner wants to know how you can on the first loop enter a value then let a feedback number take over from there

How can I on the first loop enter a number into the amplitude subsection of the simulated signal box, and then from that loop onwards use the feedback number?
I am using a simulated signal, tone measurements, and case structure with + or - calculations depending on orignal reading to control the amplitude to a user defined value.
Any help would be very much appreciated, as i have just started out on labview 7
Cheers

That's the purpose of a shift register or feedback node. They are the same thing and interchangeable. Loop at the attached picture. You initialize either outside the while loop and then whatever calculations you perform, are passed to the next iteration.
Attachments:
feedback with initialization.jpg ‏8 KB

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