John K Jordan
Instead of guessing about your system: My advice would be look at each device, write down a description and any name on it (perhaps even photos), then trace each wire/cable and make a diagram of where the wires come from and where they go as well any labels on the places where they plug in.
You might describe how it works now and how you want it work differently, if appropriate.
Then it might be easy for someone to know what you have and how things are connected and could provide useful advice.
If you have trouble with tracing and documenting, ask a teenager.