The Memorymoog is a polyphonic electronic music synthesizer manufactured by Moog Music from 1982 to 1985, the last polyphonic synthesizer to be released by Moog Music before the company declared bankruptcy in 1987. While comparable to other polyphonic synthesizers of the time period, such as the Sequential Circuits Prophet-5 and Oberheim OB-Xa, the Memorymoog distinguished itself with 3 audio oscillators per voice and greater preset storage capacity. Overview While the earlier Polymoog synthesizer (1975) featured unlimited polyphony via divide-down technology, the 6-voice Memorymoog was the first polyphonic Moog to feature dedicated oscillators and filters for each voice. It is often described architecturally as six Minimoogs in one unit. Each of the six voices of the Memorymoog is made up of 3 voltage-controlled oscillators that can be set to any combination of pulse (variable width), saw, and triangle waveforms and freely switched over a 4–octave initial range. Each voice also has its own 24 dB/Octave Low Pass voltage-controlled filter. Moog Music wisely included a discrete implementation of its famed, patented transistor ladder filter, which was first introduced in the Moog Modular systems of the 1960s and subsequently came into widespread prominence in the Minimoog. In Mono mode, the Memorymoog functions as a traditional monophonic synthesizer with 1–18 oscillators selectable in unison for powerful leads and basslines. The user may also specify any combination of Low-, Latest- or High-Note Priority keying and Single or Multiple Triggering, for an impressive degree of control. A Chord Memory function (for single key, parallel chord "planing" effects) and an Arpeggiator are also included, while an independent LFO with 5 non-mixable waveforms allows simultaneous modulation of each VCO frequency, oscillator pulse width and filter cutoff frequency in any combination. Further, as on the Minimoog, VCO-3 can also be used as a Low- or Audio-Frequency modulation source. With careful programming, audio frequency modulation using Oscillator 3 can produce convincing pseudo-acoustic and FM-like timbres typically not associated with analog subtractive synthesis. Voicing The Memorymoog uses Curtis CEM 3340 IC's as opposed to the discrete Moog oscillators used in the Minimoog and Modular units. With 18 oscillators, 6 voices, the Moog VCF and subtle on-board overdrive via the Mixer section, the instrument has a massive sound all its own and is capable of dominating the mix in which it is used. In use Due to its complex analog architecture, the Memorymoog has been historically prone to certain reliability problems, and