Roland user,
as far as sounds go here is what I think; I guess that I can speak out of experience, because right now I have side by side a VA7, an SD1 and a 9000 pro (not to mention an XD3):
Acoustic piano:
VA7: good and mellow, but needs to be played from a 76 notes, semi-weighed keyboard.
9000 pro: very good and clean (a Yamaha piano, no doubt about it).
SD1: very good and brilliant; more equalized than the others; maybe the best one for rock-pop music. The XD3 piano is cleaner but less rich and natural sounding.
Electric pianos:
VA7: decent ones, but not much choice
9000 pro: the best ones, no questions here.
SD1: forget about them; they will never cut through a mix; better on the XD3 (cleaner but still lacking any spark).
Organs:
VA7: good sounds, but weird selection (some presets are missing; good jazz Hammond though)
900o pro: excellent selection; very clean, the best ones to play jazz and latin tunes; don't forget the flute organs!
SD1: full of guts; excellent for rock-pop music; not so clean as the 9000 pro, but when it comes to rock-pop, who cares... The XD3 has cleaner sounds but less choice; the SD1 is better here.
Accordeons:
VA7: excellent accordeons both for south american music (tango) and french waltzes (musette)
9000 pro: the second one, after the VA7; the sound is too thin; maybe it would be better layering sounds.
SD1: the worst ones; the sound is not so clean as the other two. A little better on the XD3.
Guitar:
VA7: very good acoustic and electric guitars (the distorted and overdrive ones are the best I have heard among all the arrangers)
9000 pro: very good acoustic and jazz guitars (they are SO clean!). Distorted guitars not so good, but acceptable.
SD1: the acoustic are good, but the electric are the worst ones among the three; never used them. Here again the XD3 has cleaner sounds, but still of no use to me.
Strings:
VA7: good, especially the synth strings
9000pro: lush and clean; the choice between VA7 and 9000 pro is really personal here.
SD1: not as clean as Roland or Yamaha but very good in the mid-lower frequencies; they somehow lack very high frequencies, like all the Ketron sounds, but have a lot of body. I guess that they could work very well layered with the 9000 pro strings, which are kind of "thin". XD3: less choice than the SD1 but the sound is again cleaner.
Trumpets and horns:
VA7: good choice but the sound is kind of thin; I love the Mariachi trumpet: one of the reasons to keep the VA7.
9000pro: good sounds, but again thin; they need to be layered. Good trombone and trumpet. Best analog brass among the three.
SD1: the sound is dirty compared with Roland and Yamaha, but they sound more like real horns. Seems like they were played by a more inspired musician. XD3: less choice than SD1 but better sound. Maybe the most expressive trumpet, trombone and flugelhorn, but again not so sparkling like Roland or Yamaha.
Woodwinds:
VA7: best tenor sax (I use it a lot and couldn't do without); good soprano sax. Very good clarinet, oboe and english horn.
9000pro: very good tenor and alto sax and BEST soprano sax (should work very well layered with the Soprano from the VL board: can't wait to get it). Good clarinet.
SD1: very good tenor sax, full of body in the lower registers; not so good in the high register (I always use it in the lower octaves, like in the Sweet Home Chicago solo) In the higher octaves there is a noise of some kind and it sounds too much like "circus music". XD3: worse than the SD1 (the best sounds are missing)
Flutes:
VA7: very good
9000pro: very good or excellent. The pan flute is the best, clean, smooth and silky.
SD1: again, very good and it sports some peculiar sounds too (like "Andes"). The Pan flute sounds better in the XD3, though.
Choir and voices:
VA7: excellent choice. The best one.
9000pro: the choice is good with some interesting sounds, but they are thin compared with the VA7; best results if layered.
SD1: worst one, but with some interesting sounds (like "Soul sister"; wish it was sampled with a better quality and more extension towards the high octaves). XD3: lacks some SD1 sounds.
Synthesizer:
VA7: excellent choice, with many sounds drawn from the JV expansion card "Analog".
9000pro: excellent again; maybe the best leads and some great pads.
SD1: not so clean as the others, but maybe for analog sounds that's a plus. Never used them, but curious to try them out. The XD3 has less choice here.
Drums:
VA7: very good and clean
9000pro: again, very good and clean; maybe the best brushes. For the same reason, maybe the best one for jazz styles.
SD1: full of punch; the best one for rock-pop music. Cymbals lack very high frequencies, though (why didn't Ketron sample their sounds at 44KHz?)
Okay, that's all. Of course it's all subjective, but what isn't? Hope this helps (wow, it was like writing a book...)
[This message has been edited by Dreamer (edited 11-03-2002).]
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Korg Kronos 61 and PA3X-Pro76, Roland G-70, BK7-m and Integra 7, Casio PX-5S, Fender Stratocaster with Fralin pickups, Fender Stratocaster with Kinman pickups, vintage Gibson SG standard.