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All the standard stuff, and then...
There are all the usual audio measurements such as frequency response, THD+N and we can do them with calibrated precision. But what if you want to go beyond them. Way beyond. What if you wanted to plot the probability distribution of the amplitude of digital audio sample points in a radio broadcast advert and compare them with the same broadcast during the news and while playing music? What if you wanted to know the ratio of the odd order harmonics of a sine wave to the even order harmonics? What if you wanted to see the impulse response of a digital reverb? What if you wanted to know how much jitter your AES3 interface can take before it loses lock? What if you wanted your unattended analyzer located at a remote site to email you with measurement results if it detected a multi-tone test signal on a radio link? What if you wanted it to automatically create a hierarchical web site detailing over 3000 measurements of all the inputs routed to all the outputs of a large scale mixing console?
 
     
   
  dScope Series III user programmed FFT detector showing the ratio of odd to even harmonics
 
     
 

These are all real applications that Prism Sound test equipment has been used for and there are many many more. Some of them can be done out of the box. Some require some automation from within the dScope application. Because the dScope Series III audio analyzer is a soft instrument, it can be used to get those hard-to-get results. Automation can be used in a wide variety of ways to simplify complex processes and to make the difficult possible. The user defined FFT detector can be programmed to return a result that can then be used as any other FFT detector result: it can be swept, limit checked, used in regulation routines, etc. etc.

PS...
If you really did want to see the probability distribution of the amplitude of digital audio sample points in a radio broadcast advert and compare them with the same broadcast during the news and while playing music, here's one we prepared earlier: