Question About Pitch Raises

[Robert Finley]

Please could you explain to me how you determine if a pitch raise is necessary on a piano and by how much? The question I have is that the strings on the piano might be flat by different amounts, so is the amount of pitch raise determined by the flattest note or the average of the amounts of flatness of several notes, spread over the piano?

With an ETD such as the SAT III you can determine how many cents flat a string is by looking at the display and then use it to perform the pitch raise. How do you determine this aurally and do the pitch raise if you don't use an ETD? Thank you for your help. 

Robert Finley
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