Hi.

First, congrats with your KN2000, it's still a great keyboard,
even today.....
This is not a unknown problem.
If you perform a searc at this forum you'll find several posts
with similiar topics as this:
http://www.synthzone.com/ubbs/Forum25/HTML/003212.html

Good luck and happy playing
GJ
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Cheers 🥂
GJ
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"Success is not counted by how high you have climbed
but by how many you brought with you." (Wil Rose)