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How to continuously record the magnitude of "detected frequency" in "Tone Extraction"?

Hi,
I'm using SignalExpress Tektronix Edition to acquire signal from oscilloscope. I use "Tone Extraction" to gain frequency peaks and their frequency values. What I want to do is to continuously record the magnitude of the "detected frequency" in "Tone Extraction", which keeps changing. I searched for such function that can output magnitude value if frequency is inputted, but I didn't find it. 
 
So I'm wondering if this problem could be solved by adding "User-defined Step", say a VI that is programmed to gain the frequecy value and returns magnitude. Hope can get your help. Many thanks!
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Hi:
 
   The "Extract single tone" vi HAS a detected amplitude port.  I'd just wire that to a graph or datalogger input.
 
Eric
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