Achieving truely rich and colorful sound in Pianoteq

To me, a certain piano sound tends to be best for certain musical compositions or styles.  There is no one perfect piano for all styles.  This is one feature that makes Pianoteq so desirable.   There is a lot of choice, with a lot of possibilities.  Try learning to tune an acoustic, and your will learn a lot about the many reasons Pianoteq is such a great instrument.

I'm sorry.  Where is the video?

Alex, the rather ambient recording in that video *does* actually contribute quite a bit to the perceived richness in the sound. The instrument seems to be captured from quite some distance in a rather spacious and reverberant environment, and all that interaction (between the source sound and the room) does add significantly to the complexity and richness of the recorded audio.
That same instrument in a smaller and drier space will generate a completely different and, to your ears anyway, possibly less rich sound.
All this to say that you actually *do* need to bring reverb — and quite a bit of it — into your attempts at creating that sound. WIthout reverb, you’ll never get close (or ‘distant’, which is part of what ‘close’ in this particular case means).

Secondly, and I’m sorry to have to say this, but the contents of that midi-file aren't really of the quality that would make any instrument produce a 'rich sound'. Sound begins, in no small measure, with the way an instrument is played, and unfortunately, the ‘playing’ in that midi-file lacks rather a lot of what is required to bring out the best in Pianoteq. There’s no real coherent performance, no pedalling, no dynamics to speak of …
I'm pretty sure that if you were somehow able to play (or get access to) a more pianistically driven performance, you'll find it a lot easier to also get nearer to the sound you're after.

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You were right, just simply putting sustain pedal half way down (my simple gear doesn't allow for full range of its positions) make it sounds significantly "richer" and closer to original.

Unfortunately, I only have Stage. So my only option is a combination of model preset, equalizer and some effects/reverb. But it seems that no ready reverb preset suites my tastes: small hall is not rich in terms of reverb enough, and medium/large hall are TOO rich )) I'll probably will need to create my own reverb preset. And also adding a pedal is a great option. I don't know how to use it, so I just keep sustain pedal half-way down (Casio allows for one midway position of it), and it indeed gives me MUCH more beautiful overtones, why still don't distort sound too much, like medium/large hall reverb presets do.

When I created this topic I thought that piano has enough capabilities to produce a rich, reverberating, live sound on its own. But it seems I was wrong and room plays even bigger role in it than piano itself. And I also totally overlooked the fact that Pianoteq may imply that you are using some external speakers to play the sound, so your own room can participate in the whole process. As I'm using headphones, I must add reverb artificially for it to sound naturally.