When a real (wood&string) piano goes out of tune, it usually goes out of tune with itself also.
In other words, tuning the recording to make middle C in tune will move other recorded notes just as much, but they may still be off from each other. Actually pretty likely.
It's very rare a piano goes out of tune on every note in even amounts.
Just something to consider in your decision.

If it's out of tune with itself that's pretty hard to correct with all the overtones and such that exist on a real piano recording.



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