Save all your settings and do a factory reset to see if this solves the problem. (Make sure you test it before you load your settings back)

If it’s ok after reset but the problem returns after you reload your settings, then you will have to look deeper into your settings to see what has changed, otherwise you will probably have to contact Korg as it might be a hardware fault.

Bill
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English Riviera:
Live entertainment, Real Ale, Great Scenery, Great Beaches, why would anyone want to live anywhere else (I�m definitely staying put).