I am going to set up my keg system to handle beer and soda. If I want to force carbonate, and pour both soda and beer how many pressure or regulators will I need?
You will need two. One for forcing carbonation and soda @ 25 psi and one for servicing pressure ( 5 psi) for the ales. You can have two regulators on one CO2 bottle, so there's a small savings.
The alternative is to have one regulator, one manifold and set the pressure for forcing and soda. That is what I do. I keep the ale keg valves shut off and burp them just enough to keep the ale flowing.