Aries modules were available both as kits and factory modules. This module did not appear in the 1975 catalog and sold in 1977 for $179.00 in kit or $295.00 assembled. This module appear to be a kit due to the build and solder quality.
I combined specifications from Robert Leiner (with permission), my photos, and a reverse engineered schematic into a PDF document.
AR-332 Dual VCO Document
Each ramp VCO is in a large potted module with a sync and 1V/Octave input. The other pins consist of +/-15V, ground, output, and the timing pin so a larger capacitor can be paralleled for LFO operation. The PCB circuitry consists of a dual op-amp for control voltage summation and ramp to pulse generation. I was not able to tune this module to 1V/Oct with the single turn 50K trimmers and replaced them with 20K 20 turn trimmers (the VCO tunes to 1V/Oct with the trimmers set to around 10K so I reduced the value from 50K to 20K).
The PCB is a single sided tin with no solder mask. Care is required when doing repairs as the pads do lift easily. The VCO-B ramp output had low amplitude and significant DC drift which is unrepairable without depotting the module. The extra op-amp and circuitry on the rear of the PCB is an AC coupled gain circuit to bring the VCO B ramp output back to 10V pk-pk and center it at +/-5V.
This scope image shows the VCO B potted module ramp output. The amplitude has decreased to 7.4V pk-pk and it is centered around -6.5 volts. This renders the pulse generation circuitry useless as it is outside the comparator range. By AC coupling and bringing the signal back to 10V pk-pk the pulse circuitry operates correctly.
I AC coupled the ramp instead of using a DC level shift as I believe the DC drift might continue with time. AC coupling makes the ramp output in LFO mode very non-linear but the pulse output can be used for narrow pulses at low frequencies. This image shows VCO B in LFO mode at 0.117 Hz with a very nice pulse output. Because of the AC coupling the ramp output has shifted negatively but still has a 0 volt DC average.