ok heres the deal I have a spector neck through with active electronics. I noticed the other day that when i plug my bass into the amp it makes this real loud sitorting sound for about 30 seconds then goes away slowly. Also, when i turn some of my knobs they make kind of a hissy scratchy sound. I THINK that this might mean i need to clean my pots, and if so how do you do this??. If yo guys have any idea what my problem is could u please drop me a line. I checked and its not the amp of cable, and i don't run any effects. thanks.