Scale Design Aural Proofs
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This final graph of the corrected "Economy Model" of a Japanese Manufactured small grand is included to demonstrate that you can even hear the small anomaly starting at E3. If you play the Octave recording (starts at C3-C4) it will move up by 1/2 steps and when it reaches the 4th semitone (E3-E4), you can actually hear upper partial beating kick in as pictured on the graph anomaly. As the octaves come back down they will get cleaner at Eb3-Eb4. I can certainly hear it so I hope you can as well. As these octaves were tuned using the 4:2 Octave test what you can hear at E3,F3,F#3... is the 6th partial colliding with the 3rd partial.

Play the Octaves recording

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