markb said:Try eliminating your cables first before dumping pedals. I had a curly guitar lead back in the 70's that not only picked up radio stations but could be "tuned" to different frequencies depending on how much you stretched it.
markb said:Take things out of the system one at a time. Do you always use the same cables to connect that compressor? I'd be surprised if it was the pedal, the best way to unintentionally create an aerial is with a faulty shielded cable. It might be there all the time but you only hear it when the compressor pumps up the signal enough.