There is an edge connector that I'm pretty sure has a voltage output on it because two pins are that are next to each other are connected.
I'm assuming that is the only edge connector voltage I will be able to use and I need it for volume control.
This means I have to control two things with one voltage source.
I just don't know how to make two voltage sources out of one, that's all.
The two amps. How exactly will you be connecting to them, and what sort of signals/voltages (inputs to them), do we need to control them ?
Most amps, have their own built in potentiometers (volume control or remote control signals), to control themselves. So it is not that easy to control them via an external voltage source. But there are ways of doing it.
EDIT:
Or it might be more practical to attenuate the input signals (adjust their volume), before they enter the amps (but that method may create more stray noise and maybe distortion, depending on your setup). It depends on your exact setup. I still can't really see the overall setup you have/want.