via this auction
"The low pass VCF in this is the same as the 4035:
'Overview This is a classic "moog" transistor ladder low pass filter with the usual 4-poles and 24dB cutoff. In 1974 ARP went back to their "moog" filter design (the 4012 module used in the 2600) and updated it to use transistor array chips and put it into the Odyssey as the 4035, and the Pro-Soloist and Explorer 1 as the 4034. This two modules are virtually identical and both are temperature compensated.'"Some pics of the inside below.
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