Grand Imperial string res noise.

[Frantz]

I remember the Italian Grand having a buzz noise on the Eb5 key
I recently dicovered the Amber Upright has a resonnance on the Eb3 key
These are in the samples, from the original instrument

[pterm]

I still do not hear it. I wonder: does it happen on a single note strike?

Here's what I did (from memory, please forgive any discrepancies with Audacity):

1. Open the file "nord Grand imperial noise EQ.wav" in Audacity
2. Select the track
3. Go to menu Effects>Amplify... and increase gain (default brings peak to 0dB level, about 33dB gain)
4. Put your best headphones on and play tracks

The "chirp" sound occurs a fraction of a second (maybe 0.25s) after the key strike. It sounds somewhat like a bird chirping, which is what made me think of a "chirp" waveform.