Stretch tuning, equal temperament and other mysteries. If the keyboard has a reset to factory try that. My better ones have a way to tune to other than a-440 so check that and any pitch bender, it might need some wiggles.

But your ears are probably used to the grands tuning and the keyboard is dead on, or less human. Try a tuner on your computer I have 4 or 5 and check it.

Good luck faites le fun!


John Conley
Musica est vita