Hi Roy and welcome to the forum. I'm not familiar with the KN901 but I believe it was released around 1995. Having done a search, it looks similar to several of the mid-range Technics keyboards so if you have any specific questions, I'm sure some of the forum members will be able to suggest answers

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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....)