Vintage ADC Soundshaper SS-10, 10 band graphic equalizer. Silver, includes manual. I bought this new in 1985, and haven’t used it in at least 15 years. In great condition. Includes RCA patch cables. These were fairly well regarded back in the day. Here’s a little video on the equivalent model in black: https://www.youtube.com/watch?v=jRTLpD209-E It has been tested by another potential buyer who decided not to take it - so we know it works!!