I'm with Gary here on a few things. Basically there are things the MZ-2000 can do that the PSR-3000 can't touch and vise versa. You have to really think about your personal needs and figure model will work best for what you want to accomplish.

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.