I've been thinking about this (bolded) statement since you made it, Dave. I decided to do some research.
According to Wikipedia
Casio: 11,336 employees, $4.616 billion revenue (2010)
Roland: 2,699 employees (2010)
According to their corporate info pages (and I hope I'm comparing apples to apples here)
Casio: ¥48,592 million capital, ¥301,660 million net sales
Roland: ¥9,274 million capital, ¥74,825 million sales
Overall, Roland is a much smaller company. That said, I don't know how Casio's EMI division compares to Roland. That would tell how much of Casio is in this business vs. all of Roland.
I'm sure Mike could shed some light on
this (if he can disclose that), but I have
a feeling Casio's EMI division is far smaller than
Roland.. but that may very
well change in the future.
This site has a few stats...
http://www.musictrades.com/global.html