The Memorymoog is the be-all and end-all of all Moogs. Sporting three oscillators per voice and a Moog ladder filter, the Memorymoog is nothing but pure fat. Along with the fat sound comes an equally fat and heavy enclosure (and price tag), so be sure to have several friends handy when transporting the unit.
On the surface the Memorymoog is laid out similarly to the Minimoog. Three oscillators with saw, triangle, and square waveforms with variable tuning and range for each. The mixer section provides level controls for each oscillator and the noise source. The filter is the standard issue Moog 24db/oct ladder filter with variable cutoff and resonance. Note that the filter IS self-resonant. A dedicated ADSR is assigned to the filter with variable depth, and a myriad of modulation sources are available from osc 3, the LFO section, and the external inputs. The VCA section also has a dedicated ADSR, and can also be modulated by several other internal and external sources. And finally comes the master VCA with programmable level (a handy feature) and better yet, a headphone jack with level control! Having a dedicated LFO section is a great addition to the osc 3 mod functions available in the original Minimoog. As mentioned earlier, there are several assignable external CV inputs, along with a nifty arpegiattor. My unit is the stock Memorymoog, although the "Plus" model sported a sequencer and a very lousy MIDI implementation. I have retrofitted mine with a Kenton MIDI kit, and while it is a hack, is better than no MIDI at all.

Memorymoog Site
Memorymoog User Manual, Service Manual, and Update Bulletins
Memorymoog MIDI Retrofit Procedure
Memorymoog Tuning Tips and Tricks
Lintronics Memorymoog Upgrade