I've checked YouTube before for 1500 demos and most are of young children playing. I've played the 1500 and was very impressed with that keyboard. I'm sure the PSR-3000 owners will also tell you for the money it's a great keyboard. The audio demos on Yammies site are pretty good 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.