My Kurzweil keyboard seems to have gone out of tune from the lower notes to the upper notes, what happened?
Kurzweil keyboards have different tuning systems selectable, especially the K2000 series (they have about 18), and sometimes a different tuning system can accidentally be selected, making a difference across the keyboard. Equal-temperment is what is commonly used, with other forms of tuning having inherent problems with playing in different keys and octaves (which is why equal is used now). Simply select a different tuning system or try performing a hard reset of your keyboard.
For example, on the K2000 series (including the 2500, 2600, and 2660), you would go to Master and change intonation there (default is #1 Equal).
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