Concertmate MG-1 is the most popular Moog, i.e. the most people’s one – you could find it almost in every home or studio. It was produced under the brand Realistic and was sold through a store chain for radio amateurs - Radio Shack. The unit has the necessary minimum onboard for the creation of powerful analog basses and lead parts.

It is based on two VCOs generating a sawtooth wave. The built-in wave shaper converts the saw into a square wave. For each voltage controlled oscillator, an octave switch is provided. VCO2 can be either synchronized with VCO1 or tuned to an interval. The synthesizer offers a polyphonic mode based on the division of the basic square wave.

Concertmate MG-1 uses a four-stage voltage controlled low-pass filter with a cutoff slope of 24 dB per octave. The "cutoff" setting is responsible for the cutoff frequency, "peak emph" - resonance, "countered cutoff" - the depth of influence of the envelope generator.

There is also a tracking mode for the keyboard - higher notes have a higher cutoff frequency, which allows for a more natural sounding of the instrument.

The built-in envelope generator provides dedicated control of VCF and VCA simultaneously. It has an attack and decay time settings, as well as a sustain which can be switched off. Three modes of VCA operation are offered:

Contoured - the note sounds according to the settings of the envelope generator.
Keyed - the note sounds while the key is pressed.
Continuous - the note sounds until another key is pressed.

For modulation there is an LFO with frequency control and waveform selection (triangle, meander and random). The modulation signal can be sent to change the VCO, VCF cutoff frequency.

In the mixer section, VCO signals, a noise source, a polyphonic generator and a bell tone are mixed.
Concertmate MG-1 was used by KMFDM, 808 State, Peter Gabriel, No Doubt, Clues.