MOOG 55 Typical Configuration

914				904B		911	911	902	904A		992	911	993	911A	911	902	911	902	994	902
921A	921B	921B	921B	921A	921B	921B	921B	921		902	903A	995	960								962
CP3A				CP3A				CP3A				961CP				CP2				962

MOOG 3P Typical Configuration

914				905		991	994	904B		904C		904A	992	912	902	902	902	993	911	911A	911	911
901A	901B	901B	901B	901A	901B	901B	901B	901A	901B	901B	901B	901		903A	984							910
CP3				CP3				CP3				CP3			CP1				CP9

ALL MOOG MODULES:

Module	Type	Description
901	VCO/LFO	Voltage Controlled Oscillator, may used as a LFO or VCO
901A	VCO controller	1V/octave
901B	VCO
901C	VCO output stage	used on earlier Moogs (2's and 3's)
901D	VCO output stage
902	VCA	2 signal i/p, 2 o/p, 3 CV (lin or log)
903	white noise	The precursor to the 903A module, used on some of the first systems
903A	noise generator	Random Signal Generator, produces white or pink noise.
904	VCF	Voltage Controlled Filter used on some of the earlier  Moog Modulars
904A	low-pass VCF	The Moog 24dB-per-octave ladder filter
904B	high-pass VCF
904C	filter coupler
905	spring reverb
907	fixed filter bank	Fitted in the Moog 10 and Moog 12.
907A	fixed filter bank	Fitted in the Moog 15 and Moog 35.
909	power supply	Fitted in the Moog 15
910	power supply	Not full height. Designed to fit at the bottom of the cabinets
911	envelope generator	This is a full ADSR (Attack, Decay, Sustain, Release) envelope generator. Attack, Decay and Release is adjustable from 2ms to 10 seconds.
912	envelope follower
914	fixed filter bank	12-band, 125Hz to 5kHz, with high and lowpass knobs
920	power supply
921	VCO	Voltage Controlled Oscillator with a range from 1.01Hz to 40kHz
921A	VCO controller	1V/oct
921B	VCO	This 921b oscillator is said to be more stable than the 901B. It has a frequency range of 1Hz to 40kHz.
923	noise, high-pass, and low-pass filter
928	sample-and-hold	This was a separate device.
930	power supply	This was the power supply for the Moog 35 and Moog 55. It was wired to the CP8A power switch.
950	49-note keyboard
950A	???
950B	scale programmer
951	61-note keyboard
952	49-note, duophonic keyboard
955	ribbon controller	precursor to the 956
956	ribbon controller
958	pedal controller
959	joystick controller
960	sequencer	3 rows of eight steps
961	sequencer interface	Include voltage-trigger to S-trigger and back
961CP	sequencer interface panel	designed for the Moog 55
962	sequencer switch	Used for multiple sequencer control
984	4X4 matrix mixer
991	filter and attenuator
992	control voltages	illuminated red or blue switches linked to the 904A
993	trigger/envelope	Features illuminated yellow or green switches
994	jack multiples
995	attenuators
1120	foot pedal
1125	sample-and-hold
1130	drum controller
1131	percussion controller
1150	ribbon controller	The Moog ribbon controller mounted on a long thin box.
1630	Bode Frequency Shifter	Designed by Harold Bode and distributed by Moog
1634	pitch-to-voltage converter
6401	ring modulator
CP1	CV (control voltage) and trigger outputs	This was designed for the Moog 3P.
CP2	CV and trigger outputs, and filters	Not full height. Designed to fit at the bottom of the cabinets
CP3	4X1 mixer	Not full height. Designed to fit at the bottom of the cabinets
CP3A	mixer	Featuring illuminated switches that were linked to the VCO's. Again, not full height but designed to fit at the bottom of the cabinets
CP4	CV and trigger outputs, attenuators	This was intended for the Moog 1C.
CP4A	CV and trigger outputs	This unit, designed for the Moog 35, is not full Moog module height. It fits in the bottom of the rack only.
CP5	CV and trigger outputs	This unit was designed for the "P" series Moog modulars.
CP6	CV and trigger outputs	This unit was designed for the "P" series Moog modulars.
CP7	CV and trigger outputs, multiples	This unit was designed for the "P" series Moog modulars.
CP8	power switch	This unit, designed for the Moog 2C and Moog 3C.
CP8A	power switch	This unit, designed for the Moog 35 and Moog 55.
CP9	power switch	This unit, designed for the Moog 3P.
CP11	mixer, triggers, outputs	This unit was designed for the Moog 10. It has a four-input mixer,  jack multiples, an attenuator, 2 CV and trigger outs, and 2 audio outputs.
CP35	attenuators	This unit, designed for the Moog 35. Not full height. Designed to fit at the bottom of the cabinets

Modules chart excerpetd from here.