You may have remembered my post about my Sun Ray Pro head phones not working with my machine, my F-75's signals being chopped short and not repeating, and my 5 pin connector being way too tight. Well, Felix called me and said that they checked it out and yes the 5 pin was no good (they replaced it) and the non repeating signals and my Sun ray Pro's not being able to work with it was because I had a short in my F-75's head phone jack.....That's why the machine bench tested fine (I didn't have head phones plugged into it when I was bench testing it, hence, normal repeatable signals). Well they replaced the head phone jack and also said my coil was out of balance??? So they are sending me another. I went ahead and had them do the $50 dollar upgrade as I will be using it in the rain. So I am glad I sent it in, probably should have done it months ago, but it's kind of a pain in the arse. I will let you guys know how well it works when I get it back.