Hi Tristian,
i use to own a Kn 6500 for a few years and now a yamaha Tyros 2, I am answering these questions based on my personal experience and opinion.
1)how do the styles on the kn6000 stack up against todays arrangers and are they as editable.
The styles are completely editable just the same as the latest arrangers on the market. (I personally preferred the Technics sequencer over the yamaha). the styles compare well and are very usable. the KN excels in the jazz department. For Rock and pop I would personally say the onboard styles are not quite as modern as the yamaha's (not sure about roland / korg)
2)how is the sequencer on the 6000 ie does it have a step input similar to the kn2000 of old.
I never owned or touch ed KN2000 but i can tell you the sequencer on the Kn6 has the step input using the grid layout. (VERY USEFUL I WISH YAMAHA HAD THIS!!)
3)how are the voices of the keyboard against say a triton, roland xp80 or motif. I know they will not be as good but how far behind are they.
the technics voices are great for its time. i HIGHLY recommend getting the KN6500 upgrade kit as this gives you better voices in every category. you cant go past the Concert Grand piano and the new acoustic guitars and the soloist brass / woodwind sounds...
some of the woodwind and brass sounds are extremely close to the Tyros 2 quality. (some might not tell the difference)
I feel the biggest weakness is the drum kits.
4)can you import styles into the kn6000 if so how is it floppys or usb.
you can import styles and midi files only wit h a floppy disk. the annoying thing is, whenever u want to import a style u need to load it up to the 20 custom styles first which takes a bit of time before you can hear it.
with yamaha you can insert a usb key and play them instantly without having to pre load the styles into the sample memory onboard... i think the KN 7000 SD card feature was a big improvement over the floppy disks on the KN6.
5)can the kn6000 scan the whole keyboard for chords ie if I play all piano on a piece can it see the chords I am playing and put a backing behind it or is it just left hand only (this would be a deal breaker)
The KN 6 has full piano mode so YES you can do what you are asking.
6)what should I be looking for weakness wise on a used 6000.
not really much, just make sure that the paint on some of the commonly used buttons has not been scratched off.
7) ok somebody sell the kn6000 to me I thought that a workstation might be the way to go but if I can get a kn6000 what would I be missing of a motif. triton of fantom and what would I be gaining.
the KN 6 IS a workstation. BUT its NOT a synth like the motif, triton or fantom. completely different things. other people on this forum can explain this better than i can. but u cannot compare a Kn6 to a Motif/fantom/triton as they are different instruments for different purpose...
hope this helps
Nick
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Roland G70 / Roland BK9 / Roland GW-8L / Roland Fantom O6 / Yamaha Motif XS / Technics KN6500