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Multivox MX-8100 Computer Basic System Music Sequencer

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The Multivox MX-8100 CV/Gate synthesizer keyboard/sequencer was made by Multivox Corporation of America out of Hauppauge, NY. It features 37 keys, the ability to record and playback up to 4 sequences of notes, both Exponential (Hz/Volt, Moog, etc.) and Linear (Oct/Volt, Korg, etc.) output, and multiple tunable parameters.

On the left front of the board is the sequencer section. You can select any one of four memory banks, play and record a sequence, then play it back by punching one of the four buttons. I don't know how exactly how many notes a sequence will hold, the amount of RAM in this machine has got to be miniscule, but it's enough to set up some pretty decent loops. (There's a handy red "bar graph" to the right of the sequencer banks that will tell you how much memory you have left. But, be aware that the sequences are NOT saved when the keyboard is powered down.)

Going on to the right, you have controls for setting your sequence to one time or endless, as well as for setting the tempo of the playback. You can shut Newkey Trigger on and off and adjust the Portamento rate.

The rightmost set of controls on the board is a lot of fun, allowing you to adjust the Slope, Frequency, and Range of the CV output, for both Exponential and Linear CV. I don't know the scientific definition of those terms, but I know they allow one to mangle the sound in interesting ways.

The back of the unit has 1/4" Input/Output jacks for Exponential and Linear CV, as well as Input/Output jacks for both positive and negative Gate signals.

There are also 1/4" jacks for "Remote", "Foot Switch", and "External Restart". Exactly what those do I don't know. My guess would be that these were designed to be chained together, but that's only a guess. There's also a pair of mysterious "Data Ports". They look a bit like midi jacks, but they're not. Was it possible to control this unit from some early computer? Your guess is as good as mine.

Technical Specifications
Type: Analog
Synthesis: Subtractive
Oscillators: 0
Polyphony & Tuning
Polyphony: 1-4
Tuning: Standard
Modes: Mono, Polyphonic
Patches RAM: 4
Storage: Internal
Editing: CV
Can record and store 1 to 4 different sequences.
Case: Keyboard
Keyboard: 32 keys, Non-weighted, Plastic
Controls: Buttons, Knobs, Switches, Modulation 1/4" Jacks, Sequencer
Display Type: LED
Audio Output Connections: 1/4" Phone Jack
Audio Output Count: 0
CV Ports: CV OUT, Gate Out
Power: 120V AC
Year Released: 1979
Used Price: $150 - $350 - convert
References & Sources

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