Back when "The New Rhodes" was in Production a few years back, I visited the factory and they were experimenting with different hardness tips in the transition areas to eliminate the sonical differences... If I remember correctly they introduced a few blue tips which they put in between the yellow and white tips. I got a bag of these blue tips in my shop. I haven't tried these in a vintage Rhodes yet but I must admit that the sonical differences in the New piano weren't as obvious as in the some of the older ones...