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"Hardware Upgrades Include:

* Five new jacks are installed on the rear expansion slot's cover plate: MIDI IN and MIDI OUT ports, a 1/4" stereo output jack, a 1/4" mono output jack and a FILTER input jack. Stereo output circuitry is added. If the mono output jack is used simultaneously with the stereo output jack, then the Memorymoog's six voices are spread across the stereo field (the placement of the individual voices is fixed internally). The volume of the stereo output can be adjusted only with the programmable volume pot, and the value can be stored with each individual sound.
* An analog noise circuit is added to the stereo output board to avoid the digital loop effect of the original noise generator.
* The power supply is checked for cold solder points and defective components.

* The six voice cards are removed, checked, repaired if necessary, and modified for the Lintronics Autotune algorithm. Forty-six oscillator adjustments are replaced with high-stability precision multi-turn potentiometers. Oscillator capacitors and resistors are replaced with high stability parts.These modifications ensure the long-term stability of the oscillators.
* All system boards are removed, checked for cold solder joints, tested, and repaired if necessary. Modifications for pitch bending, modulation wheel, foot pedal, and octave signals are made. After these modifications, the cutoff frequency in Keyboard Tracking mode is not only controllable by the keyboard, but also by the transpose switch, tune control, and pitch wheel.
* The Octave Board is modified so that the setting of the octave switch can be stored on a per-sound basis.
* The Digital Board is rebuilt so that the reset switch functions reliably. Microprocessor and program ROMs are replaced with upgraded components. MIDI interface circuitry is added.
* The front panel components are removed, checked, and replaced if necessary. The front panel is cleaned, and missing or damaged knobs are replaced with original Moog parts as availability permits.
* After the upgraded circuit boards are reinstalled, the instrument is 100% tested, then allowed to burn in for 7 days, then tested again."
via Scott Metzger