[jojobas]

At this point I would doubt that pro pianists could tell the difference in a blind test environment.

Regardless of what pianists will tell you, there is just one variable (hammer velocity) to actual sound production (by that point the hammer is decoupled from the key and whatever you do to the key after the first 5-7 mm of travel is of no consequence).

So the only "real" problem to solve is correctly measuring the desired speed and launching the hammer quickly enough.

[lucas_codes]

I'm a professional musician but not on piano, and even I can tell the difference.

While it may be true that velocity is the only variable, it's not a physics problem. As a player you can't choose the instantaneous velocity for the note, and the note is played at the same time or immediately before/after other notes, which all adds more variables to the touch and the movement of the musician.

Therefore the whole action matters, including how the key travels, the decoupling point, the resistance of the multiple parts of the action, the rebound... etc

It's interesting you're happy to disregard pianists opinions on the matter. Perhaps you think experts are too mired in tradition to see the truth? That may be true sometimes, but you also don't have the same grasp of what's involved as they do.

[jojobas]

You forgot the two words: blind test.

I know for a fact that experts can't tell Stradivari from modern high quality violins, can't tell if two glasses of wine are from across the world of each other or from the same bottle, rumours are they can't tell whether they're listening to a recording or live string quartet.

https://www.science.org/content/article/million-dollar-strad...

https://www.theguardian.com/lifeandstyle/2013/jun/23/wine-ta...

There is quite some variation between real piano actions of grand vs upright, 18th century and modern, German vs French vs English action etc. There's also no magic about either of them and no fundamental reason why an electronically coupled action couldn't exactly mimic them.

[lucas_codes]

I don't know about wine, but those violinists were asked which instrument they preferred, not which was a Strad.

I don't see how that or a blind test is relevant to what I wrote anyway? Except for a cheap dismissal.

[jojobas]

Why go for more expensive a dismissal when a cheap one is enough?

All I want to say is human perception is crap. You often think you feel something but you don't, you project your biases and external suggestions onto your senses and end up with yesterday's weather on Mars.

Therefore the most logical way to test whether you can really sense the difference is to deprive you of any reference for your biases, the double blind test.

[lucas_codes]

Actually, human perception is incredibly good, though I agree prone to biases. But there are no double blind studies on this, so why dismiss experts' opinions so readily?

> Electronic keyboards have weighted keys and similar tactile feedback to regular acoustic pianos, so this is a solved problem.

For professionals, the difference is huge. Seriously massive, on even the most expensive electronic keyboards. This is why I replied (unusual for me) - saying "it's a solved problem" is so far off the mark

[jojobas]

https://www.youtube.com/watch?v=nol2FX56Hfs

Not to any rigid standard, but some pro musicians can't tell the difference it seems.

[rjvs]

Likewise for narrower keys on the piano, surely.