Now I want to see if I can just freeze a lot of parameters and only upgrade the model with the important stuff left alone.

Your recording sounds like an authentic piano recording  —off some famous jazz album.  That involved an highly skilled engineer familiar with the sound of his label...

Yet, you’ve provided no details: what preset was used, whether or not it’s a custom preset, Etc.

Man, fabulous!

Thank you ! It is an old recording that i found a few hours ago. It was the blues preset with version 4.5 of Pianoteq. Hammers noise was at 1.20, that's all

Yet, you’ve provided no details: what preset was used, whether or not it’s a custom preset, Etc.

Man, fabulous!