I think that not only Yamaha could make it better. There are so many good old names on market which are lacking in one or more things. Remember Kurzweil! Their sound technology is amazing but 128MB sample RAM and 48 polyphony IS NOT the hit for a machine like that.

You can use 16 midi channels! So, you'll have 3 voices of polyphony for each channel on average. Every sound can have three layers (and more is possible). So, can play only one note per channel on average.

I wish they would build...
...an endless polyphony.
...standard sampler on-board (with 256 MB base memory).
...up to 1 GB sample RAM (SD-RAM technology would be sufficient but DDR-RAM would be better).
...standard four times effect board (24 bit DSP is still fine).
...the ability to re-sample itself (from analog out to analog in).
...highest quality AD/DA converters (16 bit is sufficient).
...internal (E)IDE controller with ATA(1)33.
...in/external SCSI controller UDMA80(160) up to 250GB HDDs.
...SCSI I, II + III compatibility (three separate external connectors).
...end price under 5,000 $US as a rack unit.

Comm'on Kurzweil, give us the dream board!!!

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Greetings from Frankfurt (Germany),
Sheriff ;-)