EICO 3465 Three Channel Translator I built in 1971. Was really cool when finished. You'd hook up Christmas tree lights to 3 separate power plugs, and then hook up stereo speaker leads to it, and the music would go on and off with the beat of the music. It also has two knobs to control the sensitivity. However, it has not been connected in 50 years, so someone electronically-inclined would definitely have to go through this and check out before plugging it in, so as not to fry the unit components out. Pretty nifty though. Link below is to a Popular Mechanics ad for this back in 1971. Price is also FIRM, since I don't care if I sell it or not. Try to find another One!
https://books.google.com/books?id=UdgDAAAAMBAJ&pg=PA119&lpg=PA119&dq=EICO+3465+THREE+CHANNEL+TRANSLATOR&source=bl&ots=bN6_kHT5h9&sig=ACfU3U0D5oC2RzyWmaM5nxcLJhEIHNCLBQ&hl=en&ppis=_e&sa=X&ved=2ahUKEwiK_oDh49PnAhWtj3IEHQT-CJQQ6AEwDXoECAoQAQ#v=onepage&q=EICO%203465%20THREE%20CHANNEL%20TRANSLATOR&f=false