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You don't see these every day. The Multivox MX 8100 is an incredibly rare note entry step sequencer. It is similar to the Roland CSQ series but incorporates the keyboard within the unit. The coolest feature of this guy is that it can control both a Roland standard cv/gate and a Korg standard hz/v and s-trig independently and simultaneously.
With all the pretty controls and lights, you might be fooled into thinking that this gadget is a synthesizer. The truth is, it doesn't make any sound at all! No VCOs, VCFs, VCAs, ADSRs, etc. All it is is a sequencer. Similar in many ways to the famous Oberheim DS-2 and DS-2a sequencers, this device can store up to 4 (short) sequences as entered from its built-in keyboard. Of course, there is a switch that lets you use it as one big sequencer rather than 4 little ones. It has two outputs; one for Exponential (Volts/Oct) synths, and one for Linear (Hz/Volt) synths. (If you can read the panel, you'll notice that it says Linear for Octaves/Volt; This refers to the sequencer output rather than the synthesizer; you must drive a linear synthesizer with the exponential output and an exponential synthesizer with linear output, thus achieving the all-important exponentiation exactly once).
This unit will allow you to record tracks using the built-in keyboard and play them back on external CV Gate synthesizers. To be clear, this is not a synth and does not produce its own sounds. It is a sequencer. Nonetheless, this is a very interesting, very rate museum piece perfect for a collector.