Here's two very shot sound clip demos of the Yamaha NP-30's two grand pianos. They're short, but give you an idea of what they sound like. Also it's MP3 so it's not CD quality. The demos are Grand Piano 1 and Grand Piano 2. You'll notice on Grand Piano 2.., there is some slight frequency ringing on a few of the higher notes.

I just banged these demos out real fast.., didn't have too much time. I'll try to go into some good demos over the next few days if I can.

Squeak
http://www.esnips.com/doc/fc96180f-350a-480c-b682-3bef8a4236a8/NP-30
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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.