Good news! My problem is fixed! I called M-Audio, explained my problem, told them I purchased the interface in a store. They indicated that there has been a revision in the interface cable. I shipped it to them they sent a new one that works! It took quite a while, they indicated that they were swamped. But, it works. Thanks to all who replied to my post, expecially the one who mentioned a review in Amazon. Thanks!
The added note is not random. It is always the C 5 octaves below middle C. I think this is a value that denotes something that MIDI uses...but am not sure.
If there is a note doubling feature, I can't find a reference in the manual. The interface was purchased a couple of years ago so it ought to be okay. Thanks for trying.
I have connected noteworthy with my Yamaha PSR-E303 with my computer running Microsoft xp using a M-Audio Midisport interface. Everything looks ok and when I press a key on the yamaha the note appears in noteworthy. But..another note, 5 octaves below middle C is also displayed. Has anyone had this problem before?