Hi Epu,
The only drawback to an "all-in-one" keyboard/sampler/synthesizer, is that to get it to market at a decent price, you have to cut down on the features, otherwise no one could afford it.
You won't find an 88 key hammer keyboard with a 128 voice 32 part synth engine and multiple effects processors and a 128MB sampler with digital i/o and SCSI, at least not one that your average person could afford.
Personally, I would rather have a decent controller such as an A-70 or A-90, and a decent synth/sampler such as the XV-5080.
As a combination, you can't beat it, and it would kick a combo unit like Korg/Kurz's butt.
The XV-5080 doesn't have an "audio in" for sampling, but it will read in Wav and AIFF files.
IMHO this is better, since most people these days will be editing the samples on their PC anyway.
Plus, I've owned samplers since the very early Roland S-10, and up through the various models, and sampling your own sounds really sucks, even in a professional studio such as mine -- it is time consuming, expensive if you have to hire musicians, and you can rarely beat the quality and price of the pre-done sample CDs by Roland and Spectrasonics or Ilio.
Who can afford to hire a symphony, rent the space to seat them all, just to record some strings...
Roland may release something in a keyboard with small sample capabilities, but in *any* brand/model you won't get the power of a full-blown sampler and decent controller.
If you are looking for something in a keyboard from Roland with sampling/playback capabilities, look at the VA-series (VA-5, VA-7, and the new VA-76). Perhaps not exactly what you are after, but it is GM/GS/GM2 with VP-9000 Variphrase Technology built-in.
David
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