Thank you, Zuki and Diki for your attention,

It is mostly improvisation, except for one Russian song at 18:18.

As for the piano sound, I might try some different velocity curve setting, but I have a suspicion that PSR’s pianos don’t really have proper samples for soft touches. My Juno DS is a bit better when you want the piano to sound dark and blurry, but the transition from “piano” to “forte” is a bit unexpected there, so it’s hard to say which is the lesser of two evils.

As for the way I sit I do get this recommendation from time to time. I used to play an acoustic piano at restaurant for 3-4 hours per night and it was too obvious that if I wasn’t sitting high enough I couldn’t play the way I wanted.

Since I didn’t have any formal training, I guess, I can say that I don’t follow any recommendations :-)