Can anyone help with this. I've a Trace Elliot GP7 bass amp but all the controls have stopped responding. If I plug my bass into it, I get a very loud slightly distorted tone but can't turn it down, up, change the eq, etc. If I plug my bass into the effects return socket, I can use the volume knob but that is all. Anyone have any idea as to what this problem might be and how I can resolve it? Thanks.