OldSynths

Hello there,
     I have a question regarding a Moog CV Pedal I recently purchased 
from EBAY. I have a Micromoog and I am curious what is the proper way 
to route this pedal. I have inputs to the filter and OSC and a jack 
for the modulation but this jack is smaller than a 1/4 inch and 
larger than an 1/8 inch. If anyone knows what this jack is for I 
would really appreciate it. But anyhow If anyone could drop me a line 
or point me in the right direction about either questions that would 
be great. Thanks