Any way to manually control the muffler exhaust valves?

Yes I know, you can change the modes. However, in my C6, the NPP exhaust was perfect. I had an aftermarket switch for it. All it really did was tap into the NPP fuse. Anyway, when activated, it stayed quiet-ish except cold start and heavy throttle. When the switch disabled NPP it was open all the time. This enabled me to keep it quiet and drone free when I wanted. It was vacuum actuated.

On our cars the muffler flaps are controlled by a motor but it seems to be opposite of NPP. In Tour mode, it stays loud and droney all the time until you give it alot of throttle, then it quiets up. Obviously sport and track it stays loud all the time. I have the SW axleback with flaps built in. I want to find a way to manually control those motors without running wires all the way to the motors themselves. I would need a wiring diagram of some type. I have a document titled CTS 2014-2017 service manual, but it seems to cover only the LSA sedans, not LT4, so there is no mention of the active exhaust. If anyone has access to the V3 service manual or any kind of wiring diagram that would be great. I'm sure the flap motors are controlled by one of the modules. I want to wire in a switch to enable to the valves to stay shut when commanded.