Hi Chuck, Just a thought maybe C2 is actually C+9 since it uses the same named notes as C+9 (ie C,D,E,G )albeit with the note D an octave down - the '2' being the second note in the scale. I use this chord quite often and it has quite a pleasant sound. Interestingly, the KN6/7 actually shows this combination of notes as C+9

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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....)