Hello,
You need to enter the "Options" tab, "MIDI".
Then you must choose a midi control to fetch the presets.
The next step would be, you go to the second column, in the same row of the control and click with the mouse on the box, where it will open a list of options. You must choose: "next preset".
You can still repeat the same steps to create a new command line for the option: "previous preset"

Thank you very much. I chosed Controller 7 and 11 and volume. This worked.

Best regards Kai

Dear all,

I am new here and hope to share my experience with you in order to find out, how to solve one issue.
On the other hand it might be useful for other owners of a Wersi Instrument how to proceed.
Unfortunately in the manual I found in the download, by the way very well translated in German (merci), I found nothing how to install organize presets in the pianotec pro.

Is there another more technical instruction anywhere available?

I did not manage that the loudness of the piano ca be altered by my Wersi OAX Instrument by preset. Can I change something in the VST Menu - Options - Midi?

I can only change the main general volume of the VST Menu in the Instrument.

Thank you and regards, Kai