Bass Amp

How do I stop the buzzing in my bass amp overdrive without shutting down?

I have a Squier P-Bass (used, for he three years), and a Fender Bass Amp (B-December 30 Bass Digital Entertainment Center). I was using effects Overdrive (built in amp) and I usually do not become bad buzz, but recently I've noticed and I was wondering if the amp or the bass (Needs new strings, maybe a problem of collection). Anyway, how do I try to reduce the buzz, without completely eliminating overdrive?

If it is an electronic buzz, something is probably not the earth. It can also be caused by fluorescent or neon lights on the same circuit. single-coil pickups are notrious to pick them up.

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