Hello. I have a pair of Klasik 2020. I know physically, Pianos have different peak volumes / base volumes.
But I'd like to pick piano models without having to adjust the speaker volume.
What can I do on my end ? If every Piano has a different volume, its hard to compare also.

I use Stereophonic and froze most of the values once I found a comfortable setup.

Interesting, I haven't noticed any remarkable or jarring disparity between the sound pressure levels of the models.

You can limit or match the dynamic range with the dynamic range slider and reduce the output levels to match.

Yes dynamic range differences are part of the relative realism in the models .

I use Stereophonic and froze most of the values once I found a comfortable setup.