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Try out Pianoteq! Connect your digital piano to a computer (even Raspberry Pi) and try it out: https://www.modartt.com/pianoteq

This software will make your piano sound like a $20k grand piano.

ps - another fun project: adding an LED strip that responds to the piano keys - to create a beautiful visual rainbow when you play.

There are free vsts you can use instead of pianoteq as well.

On linux I set up my midi controller with Carla to use Salamander Piano [0]:

Thank you for the share!

But FYI, the link you sent: Size 394+ MB

Pianoteq takes about 35MB :)

Yes, but it starts at $149. Unless you're doing music professionally, that is rather steep when free ones like Salamander exist.