For what it's worth, they're actually totally different machines under the hood. They share the same main CPU, sound chips, and D/A section, but those are about

For what it's worth, they're actually totally different machines under the hood. They share the same main CPU, sound chips, and D/A section, but those are about the only similarities. I think you and GP make great points about product differentiation/price discrimination though. I think this explains Yamaha's motivations.