Find great deals for MOOG Concertmate Mg-1 Analog Synthesizer – Vintage Mg1 Realistic S. Shop with confidence on eBay!. I pulled my Concertmate MG-1 synthesizer out of storage for my next Arduino project (to be described later), only to find that it wasn’t working quite right. The MG-1 was manufactured by Moog Music for Radio Shack for their Concertmate line of casio-like keyboards. However, the MG-1 is a true Moog, somewhere.

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The Contour settings can only affect Polyphony while a key is pressed due to the Polyphonic gate design. It can produce sawtooth, square and pulse waveforms, and the oscillators are detunable and syncable. First, the MG-1 power supply mg1- internal, whereas on the Rogue it is an external wall wart type.

The Polyphonic features of this synth are of particular interest as polyphony was rare in synthesizers of the time. Although this keyboard is often erroneously described as having “less” features than its Moog siblings, the Liberation and the Rogue, there is a patch which only the MG-1 can do: Sign up for a new account in our community.

The main problem with the MG-1 was a loud click a bit like a kick drum when I pressed or released a key. Audio Clip 1 Hear it for yourself! The square wave based polyphony section is described as a “cheesy organ sound” concertamte by some, and well-used by others. Go to synthesizers MOOG. I opened up the MG-1 and adjusted this, but unfortunately it made no difference at all. It is a common misconception that the Poly tones are not affected by the Contour settings.

Conveniently, the Service Manual is available online. Fortunately, by some bizarre twist of fate, I happened to have one in my rather small box of parts.

Moog Concertmate MG-1 – Wikipedia

Because it was originally distributed in Radio Shack stores instead of specialized music stores, it is easily found and is usually less expensive than a Rogue despite actually offering more. When a key is released the polyphony tone for that key stops immediately. The MG-1 was produced in great quantities for distribution in the consumer market. Pin 5 of the receives the contour signal to provide the attack and decay when you press a key.

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Radio Shack were marketing this synth to the home-keyboard crowd. This page was last edited on 27 Octoberat The Moog Concertmate MG-1 is the most widely owned of all vintage Moog synths, probably because it doncertmate produced in large quantities for the Tandy Corporation, and also its relatively low price.

However, the output showed a 3. The square wave based polyphony section is described as a “cheesy organ sound”[2] by some, and well-used by others.

All of the sound-generating features come together in a mixer allowing the levels for the two monophonic tone sources, noise, bell mb-1 and polyphony to be adjusted independently. There are RCA inputs and outputs the input is routed straight to the output for playing along with music from your stereo system but no external speakers as in most other home marketed synthesizers.

View the discussion thread.

Fixing my Concertmate MG-1 Synth

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. I studied it and the schematic, and my first guess was that there was a DC offset going into the CA amplifier, resulting cojcertmate an amplified DC signal in the output. The rest concertmare the modulation, including the sample-and-hold, will affect the Polyphonic Signal via the filter section.

The second problem was that when I set the contour for an attack and decay, the note got louder and softer, but as the note got softer it was replaced with a buzz at the frequency of oscillator 1. Against these limitations, the Polyphony is total, meaning all 32 keys can sound all at once. When a key is released the polyphony tone for that key stops immediately.

This feature makes it at least a little more versatile than the Rogue. Unique to the Confertmate is a slider on the far right side of the keyboard which controls the volume of a simple divide-down polyphonic organ sound.

MOOG Concertmate Mg-1 Analog Synthesizer – Vintage Mg1 Realistic S

As with many analog synthesizers, the MG-1’s resale price is slowly rising as alternatives and working instruments become less common, and buyers and sellers congregate online. Because it was originally distributed in Radio Shack stores instead of specialized music stores, it is easily found and is usually less expensive than a Rogue despite actually offering more.

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There are no reviews to display. Second, both Rogue oscillators share the same waveforms and octave range selectors, whereas on the MG-1 there are separate selectors for each.

The synthesizer’s features aren’t kg-1 using the usual synthesizer nomenclature, concert,ate using more “laymen friendly” terms such as “Tone Source” for the oscillators, “Contour” for cnocertmate envelope with “Rise Time” for Attack Time and “Fall Time” instead of Decay or Release Time.

Second, both Rogue oscillators share the mt-1 waveforms and octave range selectors, whereas on the MG-1 there are separate selectors for each. The colour scheme is more appealing and vibrant and helps distinguish easily between sections, again for an easier understanding by the general public not familiar with analog synthesizers.

All of the sound-generating features come together in a mixer allowing the levels for the two monophonic tone sources, noise, bell tone and polyphony to be adjusted independently. Unfortunately the pitch of TG2 cannot be controlled by the envelope generator called “Contour”. There is also no sign of Midi or patch memory on the MG I returned the switches to their proper positions and all was well. One thing to note however; the LFO cannot be used to modulate the pitch to create a vibrato of the Polyphony section.

This posting briefly describes how I fixed it, in case anyone else has a similar problem. Realistic Radio Shack Model: Polk for providing information. The Liberation and Rogue have foncertmate route both through the Mod Wheel with the same amount level. It is condertmate lot like the strap-on Moog Liberation in its doncertmate and architecture and also looks and sounds very much like the Moog Rogue.

Sounds of the Mgg-1 The input plugs are simply routed to the output plugs, and not to the synthesizer.

It is a common misconception that the Poly tones are not affected by the Contour settings.