In theory it is easy, to get the frequency of the note other than
A4=440Hz you just multiply/divide
440Hz by the proper number. For example, to get
A2, you divide by 4 and get
I read for example here: http://en.wikipedia.org/wiki/Railsback_curve#The_Railsback_curve that the true pianos are not tunes in such ideal way, and the further you get from A4, the greater the abberration is. So I wanted to get the list of the true frequencies of keys, but I cannot find it. Can you point me to one? Or maybe there is the improved equation that takes into account the Railsback curve? Or the equation of Railsback curve itself? All tables I found on the Internet present this ideal frequencies, which is useless, because I can count them myself.
I expect that the true frequencies might differ from piano to piano, but maybe you can give me just general idea what the frequency range for each key can be?