Hello there all. I just purchased a Fender Rumble 75 watt today along with a Fender Jazz FSR Ill post a picture below so you know what I am working with. Anyway when I plug it in and play it sounds fine. When I take my fingers off the strings or anything metal on the guitar there is a buzzing sound in the amp. Could it be a non grounded wall jack? Or something else. It has been a while since I have played so thanks for any help.