First, do a system reset by holding down the rightmost white key while turning on the keyboard. This may solve your problem, particularly if you have assigned the speakers in the wrong area.
Additionally, check your PA. It could be that you have it panned to the left side of the keyboard.
Hope this helps,
Gary
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Travlin' Easy
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)