There is a German company what converts Medeli keyboards with self made sound processor boards and software , the standard keyboard cost around 400 euros wit conversion it cost 1299 euro's

link : https://deebach.ecwid.com/Max-plus-p143693647

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Genos2,Korg Pa5X , Yamaha YC61, Ventilator2 . : https://www.youtube.com/channel/UCmC6hdAR1v5lYN8twfn0YbA