Uncle Dave is right. There's two ways that I've seen them advertised. You have synth weighted and semi-weighted. My old roland XP-60 had semi-weighted keys (they had metal plates fixed to the underside of the key to give it weight)... Then I've seen syths labeled as synth weighted keys. My EX-7 was listed with synth weighted keys, but there was really no weight to them.. The action was just really smooth. You'll need to try this board out before buying it.. The Korg will feel much different compared to your PA-80..
Squeak
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GEAR: Yamaha MOXF-6, Casio MZX-500, Roland Juno-Di, M-Audio Venom, Roland RS-70, Yamaha PSR S700, M-Audio Axiom Pro-61 (Midi Controller). SOFTWARE: Mixcraft-7, PowerTracks Pro Audio 2013, Beat Thang Virtual, Dimension Le.