Thanks Fran for the info.
Deane- You're observations are interesting about the BK7 and BK9. I spent a lot of time today Murphy's Music in Irving,TX playing on a Roland GW8 and a BK5. Both boards sounded radically different. Yamaha and Korg don't seem to sound that different from model to model. I'm saying that's good or bad...
Yes, GW8 and BK5 are very different, as the GW8 takes most of its sounds from the SonicCell and the Fantom X synthesizer line, while the BK5 and BK7m are derived from the former arranger line (G70, E80). I think Roland has kept the synthesizer and arranger sounds quite separate for a long time. So e.g. I always missed good saxophones in the Sonic Cell, while there are many good ones in the BK-7m.