Global key setting error? C6->C5

Hi,

Im having some trouble with my A4.
When i press C5 it sounds and octave higher. It seems to be a global setting (error?) and its so disturbing, im thinking to sell the synth. I cant imagine why would such function could be useful in any case… :frowning:

Im having this error since yesterday in all of the projects and tracks. I also tried a factory reset. Nothing helps. Do you have any idea?

Solved… it was the Manley massive passive EQ… I never though it can kill just the frequency of C5. I have spent 3 hours with this. :smiley: