Audphile1: No problem....your comment was right on. I just wanted to assure you that with a very light touch with the eraser end of a pencil, I found the two culprits immediately. I can now crank up the music and not hear the one tube in the Io singing on its own. And now I can't believe how quiet things are when I adjust the volume on the Callisto. Just about ready for JD and Lucinda to come back for more fun.
John
John