What does KSP mean?

Question

I have a Yamaha PSR-540. There are a few voices on it with another voice's name and KSP in their names:

• GrndPianoKSP
• BritePnoKSP
• ElecGrPnoKSP
• HonkytonkKSP
• El.Piano1KSP
• El.Piano2KSP
• Harpsi.KSP
• Clavi.KSP
• Vibes KSP
• Marimba KSP

To me, they sound like they are duplicates of the other voices. What does KSP mean?

Answer 1

"KSP" means "Keyboard Stereo Panning", that means for these voices, the placement of the instrument changes in the stereo panorama, depending on the position on the keyboard. So, "low notes" come from "left", "middle notes" "from the middle" and "high notes" "from right" (viewed from the player). For the versions of the Voices WITHOUT "KSP", the position in the stereo panorama is FIXED.

^{–Translated from Yamaha Europe forum post by t4chris}