Wikipedia: The Realistic Concertmate MG-1 is an analog synthesizer manufactured by Moog Music in 1981. Though built by Moog, it was sold by Radio Shack from 1982 to 1983 under their “Realistic” brand name and it was produced without some standard Moog features, such as pitch and modulation wheels. This cost cutting was aimed at achieving a lower price for the consumer market. The synthesizer also featured a pair of pass-through RCA jacks, which allowed users to mix in the radio or their favorite records into the final output of the live synthesized sounds.[1] The Moog Concertmate MG-1 is the most widely owned of all vintage Moog synths, probably because it was produced in large quantities for the Tandy Corporation, and also its relatively low price.[citation needed]

My own MG1 is in need of a switch/slider overhaul (victim to “the goo” prior to my ownership); full switch/slider/knob/pot set at Syntaur.