Hello, I am interested in purchasing an amp but the pots are "scratchy", according to the owner. I won't be able to try it out before I buy it. I am not a tech guy, I don't really know how pots get scratchy or how to resolve these issues. Would this stop you from purchasing the thing? Also, could I solve this problem myself? Any ideas what may have done for pots to be scratchy? Thanks for your input, it is appreciated!