Yesterday, my Dunlop 105Q Wah finally arrived but I ran into kind of a weird, minor problem. When I plugged everything in, I could clearly hear a radio station coming through the amp. If I stepped on the pedal enough to stop the bypass, it went away. What could cause the radio to come through? Admittedly, I've got rather shabby cables and I'm wondering if I need to invest in higher-end ones. Any ideas?