This is a relic from my father, who used to play in an electric band. I can't confirm if it works because I don't have the environment to test it. I don't know what it's used for. Is it an amplifier? Or an effects unit? This is a junk item, sold as-is. There is no guarantee it works. I don't want to throw it away, so I'm hoping someone who knows how to use it, or understands its condition, will take it.