You need to ground the recorder. Use a WYE connector to get access to the barrel of the guitar cable and find a good ground on a three wire cord wall receptacle. You don't say what model recorder you have which would have been helpful to us. We are surrounded by electric and magnetic fields and typically you can pick up 10 volts AC (with no real current) just as an antenna from the building wiring. Many music devices that run on "wall wart" power adapters have this problem. Also keep guitar away from wall warts as they emit strong magnetic fields for those that use conventional transformers.
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