The following is a common problem I'm sure, and not too serious. The 7th output on my SP sounds very distorted and you cannot really hear samples coming from it.
I've heard somewhere this is an internal issue that can be easily fixed, apparently the way the pads were designed, they are prone to get loose and malfunction in this way. It's an easy job for an electriction or if you know how to do it yourself.
I just want to confirm that that is the problem, any input would be appreciated. If you've had this issue let it be known, good looks.