Good Lord!!!! This would be one killer of a addition to ANY Yamaha PSR or just any keyboard in general.... The hell with a new keyboard... I think I'm going to save up for this bad boy!!!

http://www.samsontech.com/products/productpage.cfm?prodID=1658&brandID=4

You can scroll to the bottom of the screen and enlarge the pic.. (it's a really big pic too....)
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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.