G'day,CarolC: Yes ... Chromatica seems to be an older, European name and Continental chromatic is what they are called by people who don't see themselves as Continental. they all have a 'heart' of 3 rows ... the extra rows of buttons are simply remote-links, allowing different fingering, but playing the same reed(s). The only 6-row models I have seen were being played by Russians.
Eric the Viking: I knew there was another good reason for my preference for playing standing up!
Regards,
Bob Bolton