Change input controls during execution of a loop?

I have this program that works alright however, I would like to be able to let the user change the controls during the main loop and have it alter the parameters to the "Configure Standard Waveform" block in real time, like a real oscilloscope. I have tried moving some of the controls into the loop but it does not allow me to route them backwards into the initializer functions that I need to be outside of the loop for setup, as the same parameters need to be used before the loop. 

 Is there also a way to have the program run at the flip of a toggle switch and off again however many times the user wants?