you would loose the bigger and sharper screen, the aftertouch and the nicer feeling keyboard, the hard drive option, the floppy disk drive, the larger buttons which many have lights allowing for easier navigation, two seperate line outputs in addition to the main outputs.
I also forgot to mention that the PSR3000 has a video out for plugging into a monitor for Karaoke play.
I would say that the PSR3000 is more closely related to the Tyros rather than the PSR2100 because of it's having exactly the same sounds, styles, polyphony and functions. I understand that it's price is much closer to the PSR2100 but not's it's capabilities.
George Kaye
Kaye's Music Scene
Reseda, California