While cleaning the open tabs in my browser, I found this one which might be interesting for some of you: https://pianopricepoint.com/interview-with-jack-brand-weickert-felt/
I also thought of the fact that when piano was invented, the hammers where covered with leather, not felt. Probably it suited their taste better, since they came from the harpsichords and clavichords which have much more bright tone. Part of that was probably the problem of sound projection and volume, which at the time was insufficient.
In fact, I find ironic that the vast majority of the technical improvements from the original Cristofori's piano to the modern ones are for improving sound projection and volume -- these have been so successful to the point that here we pianists complain about the volume being too much!
CyberGene I love felted upright piano sound ❤️ So, how quiet is the U3 with the practice pedal engaged? Is it low enough to use it in an apartment and not worry the neighbors may complain?
Do they complain about TV, regular loud conversations (non-whispered, but non-shouted either), you playing your N1 at half-to-three-quarters of its volume (and more), the running in the house of your daughter if she wears non-rubber shoes? If so, forget it. If not, this may be a solution for you