When playing the Cadd9 chord, if you set Technichord to Close rather than Block, the discordant sound disappears. I tend to use Close, more than Block since I find the Block a bit overpowering at times. When you consider that Block adds four further notes to the played melody note, this would seem a little unrealistic. How many pianists play a full 5 notes with the right hand, for every melody note?

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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....)