Just a thought - do you have a footswitch connected and configured for Sustain??? If so, try disconnecting.....

Re. Virus - Highly unlikely - I doubt if anyone has ever written a virus for a KN2000 or any other keyboard..........

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Willum
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Willum

After silence, that which comes nearest to expressing the inexpressible is Music.
Aldous Huxley
( especially when the music is played on a KN7000....)