Explain the difference between "Weighted Hammer Action" and "Scaled Hammer Action".

The term "Weighted Hammer Action" means the feel of the keys has resistance like a real piano. The keys feel heavy.

"Scaled Hammer Action" is when the keys have a different weight to them as you go from the low notes to the high notes. The keyboard plays heavier for low notes and lighter for high notes. This allows the player to have the most realistic experience when playing.