hey i have been fiddeling with how to record demos on casset tapes for a while and i seem to get feed back from out of nowhere on the tapes when using my electric guitar any one know why and dose any one know how to double track on the tapes thanks

Are you plugging directly into the recorder or are you placing a microphone to the cab? If the latter, try turning down the gain to avoid clipping. If DI check your levels as well.

If by double track you mean overdub, you must first be using a multitrack recorder. If you are, record the first segment on a track, then set that track to "monitor." Then input your signal while the first track is playing back.

you need a 2 track(at least) recorder to double track.as for feedback, it is the microphone of the device. try plugging a microphone on the recorder and put it in some distance from the amplifier to avoid feedback. I hope i was of help.