The GW8-L has double the ROM of a Sonic Cell (what all the GW's are based on) with an emphasis on Latin sounds and percussion (pretty damn good percussion). I don't think there IS a 'basic' GW-8. All GW-8's have SOME kind of addition (either Latin, Eastern European or Asian, I think) to their basic shared ROM.
Do a search for GW-8 here. Several people have reviewed it, including me...
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An arranger is just a tool. What matters is what you build with it..!