On the KN7000 the Operating System Version can be seen by holding down 'PIANO, GUITAR and MALLET&ORCH PERC' buttons and then switch On. These buttons are all next to one another and are the first 3 on the left of the top row. The layout may be different on the PR804....

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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....)