I have the 2000, but I can't say I noticed a tremendous difference in sounds when I compared the 2100 to it. I agree with Dave . This falls into one of those "subjective" categories.
When I define "punch", for myself, I'm looking first at the basic rythym instruments, drums.. bass, etc..I have all 3 of my boards going through the same sound system, and the mixer / eq settings are similar for them.
For myself, and my own subjective tastes, the 2k and likely its successor the 2100, would be my last choice for recording work when I'm looking for instruments that "stand out" or have "punch". Even in a mix, the bass doesn't sound "real" to me. It sounds like a sampled sound.. same with the drums. I choose to work with my Motif here more often than not because many of the sounds in it are velocity switched, meaning a different sample / midi parameter can ( and in many cases does ) play at different velocities.
My PA80 ( an arranger ) is in the middle ground.. pretty good for producing drums and bass that don't stand out a lot but sound fairly realistic. It doesn't employ velocity switching in the way the Motif does, but it employs other midi functions that can add to the realism or punch. One example that comes to mind immediately is it's ability to produce a sound as pressure is released from a key. I can use the raw sample data and make new sounds on the PA80, so what I do is add key click and fret noise samples to an acoustic guitar sound, and have the clicks / frets activate upon release of key pressure. Gives me a pretty realistic sounding acvoustic guitar. The 2k series doesn't have any capabilities to match that.
For live play, I don't necessarily need for the basic rythym sounds to stand out, as I'm trying to feature my own playing and vocals.. so the 2k is a good choice here.. If I'm going to feature a lot of acoustic piano or wind instrument emulations, I usually leave the 2k home and bring along the Motif... Stiffer key action for the piano and breathe controller for emulating wind instruments.
Now some of the other 2k / 2100 sounds hold their own very well vs my other boards. Were it not for the fact that I have a breathe controller and the vl plug in for the Motif, I'd likely choose the 2100's flute, trumphet, and sax sounds every time for rcording. The PA80 has a good sax and decent flute sound.. but I prefer the 2ks better. As far as synth sounds.. very basic and good synth sounds from the 2k series.. I don't expect to get those "unique" custom made noises that can be had from a dedicated synth or even the PA80 ( which can come a lot closer to a dedicated synth because of it's editing power ).
My way of looking at the 2k series is that they are a "safe" choice" for a player in that.. they do mostly everything reasonably well, but they don't have ( at least for me ) a whole lot soundwise that makes them stand out against other arrangers / synths. I guess the one thing that does set them apart though, in my mind, is all of the support available from users in the form of add ons.. styles.. stylemakers, other files..etc. For me, each of my boards has its merits, and I don't want to give the impression that I don't like the 2000. It is a very handy board to work with and an excellent backup to my PA80, but I'm not looking to make cutting edge sounds with it. Again, this is my opinion only. More often that not, I see that people prefer the PSR stuff in a lot of ways...
AJ
[This message has been edited by Bluezplayer (edited 08-14-2003).]
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AJ