Thank you all for your nice comments.

I have replaced it by a new version. I left out the experiments with the time changes in the beginning to make it better consumable. It's a little shorter now.
And I had crackles in the bass. I could get rid of them by accepting the option "Inform plug-ins of offline rendering state" in the vst preferences of Reaper.
Last but not least I finally switched off the foot pedal in the piano in the second half which I had forgotten.

Guenter