The new P284 is awesome!

I am trying the [Petrov 284 Mistral] preset and and am noticing that the g' key is sounding strange, muffled.

Does not sound right to me.  Anyone else has noticed that?

Agreeing with Key Fumbler (very generous of Modartt to give 2 flagship type pianos for 1 pack) and groovy (Muffled = velocity curve, great start point)

Yes, definitely the Mistral is the primary flagship (nearly bought one some 9yrs ago - but for space when moving).

I'm thinking the Ant. embodied everything loved in the top ranges of the piano over a century plus, by the namesake originating family member 150 years ago (Antonin Petrof).

The Ant. Petrof seems to me almost as 'big' in various ways yet being slightly smaller (yet still on the largest scale compared to most grands), suited to 'more' concert halls which may not best accommodate a larger piano. It forcefully fills a space with great tonal range, whereas the Mistral does that, plus also exhibiting a wider range of expression (from close recording to filling the largest halls).

The Ant. kind of sums up 'all' the Petrof sound in a nutshell - and the Mistral is the current and future flagship, which does that, and more.. but that's just myself leaning into what I've gleaned over time and what I've ingested from media releases and showroom people.

Even Modartt personnel may not be given exact information about the Petrof internal differentiation.. because, just like any great art, it is often about "what is loved", "why" and "how can we improve from this point" and like most piano manufacturers, different pianos at different sizes have some obvious use cases - but the Ant. and the Mistral are sharing that same top end territory IMO.

If our dpiano keyboards are not 'perfect' with the default velocity curve, it's musician task 101 to adjust things like raising or lowering velocity curve where it sounds 'not right.' (like getting a piano technician to work on the hammer felts as a minimum.). I'm just amazed at my age to have a software piano which is so pliable as that and beyond into soundscaping territory as well (like an infinitely malleable snyth).

All the rest (the FX and other 40 controls) is arbitrarily to move exact things towards more defined tastes or recording requirements etc.

Absolutely, and Pianoteq allows us to go where no sampled piano has gone before!

This model, probable a intermediary between Ant Petrof and Petrof Mitral 284, also sounds very nice:

https://www.youtube.com/watch?v=7IOoZiFH1Ek

9 foot 2 inches (282cm)

Interesting.
I went back through the other acoustic pianos and heard those improvements across the board. The Petrof models are both strong performers.

I cannot say I have a favourite anymore. It's more like having different colours in a palette.
Back when I first got version five I did have a firm favourite of the Bluthner.

The maximum sustain (decay) of the Petrof Mistral 284 is 90 seconds.

Many thanks Modartt for another impressive instrument. Comparing it so far with the NY Steinway D - my choice for Romantic repertoire - the Mistral has a much more open sound, with more instrument resonance, as opposed to added room resonance. Consequently the Mistral sounds as if it is coming from a larger space, whilst at times, in quieter, simple, passages, you can feel/hear the resonance coming from the soundboard as you would with an acoustic.  (That shimmering halo around the notes)  In contrast, weirdly, the NY D sounds as if it's coming from a smaller space.  An almost intimate sound.  Which is weird! (Returning to the D for a period its power was evident again and the sense of intimacy faded)  For the first time, having with my setup difficulties with earlier instruments in the C4 - C5 register, I adjusted the velocity curve for the Mistral to give it a little more bite rather than reduce it.  Previously I have always had to tame that register somewhat. As I have experienced before with new or updated instruments, there is a real sense of a different action/tone/attack/dynamics you get from moving from one acoustic to another. Which is also weird, but is a tribute to the realism of the sound. I usually set the dB level at 60 for other instruments.  For the Mistral I reduced it to 55 and may go lower. it seems much more sensitive to changes in weight of touch and, rendering a few midis, pianissimo became almost inaudible against the "normal" f and ff. So it was even more a sense of having a different action than usual.

My preference lately has been NY D for Romantic music, Bluethner for Haydn/Mozart etc. Counter intuitive, but the sound of the Bluethner is so beautiful and the NY D had to fight to retain its spot for later music.  The Mistral has yet to convince me to supplant either - it lies between them in many respects and I need to do more work on the treble register. Dare I say that with my system the openness in the upper register comes a bit too close to hollowness? Not actual hollowness but some slight hint of it. I suspect with a little work the Mistral will prove itself to be the impressive instrument it is, but the competition is between several wonderful instruments each excelling in different ways.

That it was free having already got the Ant. Petrof is the ultimate bargain.

Many, many thanks.

Who would say the sound it's coming from a digita lmodelled piano?

https://www.youtube.com/watch?v=sw9mA-38_OU