Whistling on a single note

Better, but there is still a lot of digital compression. Just look at the size of the MP3 file... 2:40 seconds -> 640Kb! It should have weighed 3 Mb if it had a bitrate of 128 Kbit. This one must have 64 or 32... Curiosity, what phone did you use to record?

I'll let you listen to the piano that just arrived home.

I am using a Samsung Tab 4. Could you recommend a good app?

I think that if you make a video, the audio should also sound better. It seems to me that tab 4 records HD video. In that case, the audio should also be less compressed. Upload it to YouTube and paste the video link here. You will see that it will sound much better.

Question.... Did you prefer the piano when it first arrived or now? For me, the feeling of over-intonation remains even if the quality is better

I prefer it now! I can control my touch, and then hearing the fundamental [note] puts me in difficulty, a healthy difficulty.

The important thing is to be satisfied; there is nothing worse than having to keep an instrument in your house that is not fulfilling. Personal taste or opinions regarding an instrument will come and go. Because the piano is a bit like underwear, a personal object.

Ciao