eddiepiano Does anybody of you has ever seen or played or heard anything additional of the Lachnit keyboards?
The short answer is no, exactly because they are so expensive.
Deleted You realize that 5 grand get you a complete acoustic piano from Yamaha WITH continuous optical sensors, USB MIDI and CFX + Binaural + Bösendorfer samples (VRM) already built-in.
Well, the digital part of that acoustic may not be particularly, good, but that's an excellent point, for why the FLKeys are so seldom seen (well, beside the small manufacturer, but if there were demand, I'm pretty sure they could ramp up production).
eddiepiano I know - my FP-30 Pianoteq curve also looks wavy and not at all linear - because it's too easy to play ppp and pp with the Roland I have a slight rounded "hill" in the lower velocities; then it's back to linear because that works fine with the p - f range, and because it's to easy to reach fff the top end is "rounded".
Frankly, with this comment and many similar others you have posted, I think you can be happy only with a custom made instrument. I am not sure whether or not that custom made instrument for you is the FLKeys, but it might.
One other thing to ask yourself is why are you buying a digital piano instead of an acoustic. Ask yourself this question with an open mind. Then, look at this instrument: https://keybird-instruments.com/ -- would it solve the problems that made you think you could not get an acoustic? It's lightweight, it's inexpensive, it has a good action and good sound (well, at least it is said to be so, I haven't tried it). Could it be what you seek?
Alternatively, I've already told you so, but I'll repeat myself: if I were you (wait! as I told you, I think I indeed am like you 🤣) I would build one to your specs and tune it (pun intended) to your perfect liking. A-la Cybrid, as I am in fact doing for myself. The budget you have is very generous for a DIY project, and as such, you can take some shortcuts, which I am not taking. For example, you can start with the smallest/cheapest upright which has a satisfactory action, improve the latter with regulation, and install the spring-based repetition improvement kit which has been discussed on this forum before (sorry, don't remember its name now). Removing the plate will be complicated/expensive, but perhaps you can leave it in place, as @vagfilm plans to do, or if you buy in a store (easy with your budget) you can ask their technicians to do it for you at an additional fee. Alternatively, you can ask Keybird if they'd sell you only the action, and/or action+cabinet (no strings), which I think they would. Boy, I kick myself for not having asked them, I thought I had not left any stone unturned when I was trying to search for somebody providing a complete action. Even better, we could discuss with them if they'd be interested in building a hybrid piano using the piano-conversion kit. First just as a custom for you and few others (again, @vagfilm ?) perhaps later could be a business for them, so they might be interested in such custom work (which usually companies turn down).
vagfilm MIDI resolution of 4096 steps. This a marketing mumbo-jumbo. All manufacturers at some point in their calculations end up with velocities with that kind of resolution
I agree with the spirit of this comment, but I have not tested any of such keyboard, so in a scientific mind I abstain judgement, and just say all other things being equal I'd take the 4096 instead of the 127 velocity values, but all other things are never the same.
eddiepiano But it could happen that I hit a note twice with the same velocity and that would mean I hear twice the exact same sound. With more steps there is much, much more timbral variety (like in an acoustic piano, where it is more or less impossible that two notes sound the exactly same). I know that these differences would be very subtly at best or not even conscious. But it would be a step in the analog direction of an acoustic piano.
That's a good point, but given how bad (to my ears) are the timbre of all the virtual instruments I have heard, I think it's a moot point today.