Hi again! Key sensitivity solved. Roland customer support says the black keys might be slightly different in sensitivity from the white keys, but there should be no difference among either type. That is, all the white keys should have the same sensitivity. My C above middle C was definitely a bit hot. I played a display unit at Guitar Center and confirmed that it was not this way, so my unit had a problem.

It turned out I was RIGHT at the end of my return period with Musicians Friend. They gave me EXCELLENT customer service in swapping out my Juno. My new Juno DS88 does not have the problem, and I am pleased.

Jeremy