Rob,
Yes, you are right, the control voltage in/out must be linked to get one unit function in "stand alone mode"
If you have two or more units (also Auto Flanger and Auto Phaser in a combination) you can use one unit as a "Master" to feed the other units, so they are tracking with same sweep speed and with.
In this case, the "Master units" voltage control in/out linked, and also feeding the other units control voltage inputs (not linked)
Yes, I have the schematics, but on very big "blue copy" sheets, so in the future when I have time, I will convert them to smaller size, and scan them to my web-site schematic archive.
--Bo