I recall the PSR-2000 having line outs, which were RCA plugs on the back of the keyboard. Not sure about the 3000 though. I always used the headphone jack for recording using the Zoom H2 and monitoring with the headphone out of the H2.

Gary
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!

K+E=W (Knowledge Plus Experience = Wisdom.)