Want to add on to my indoor surround sound. Currently I have a 6 speaker and one sub woofer system working off of a Onkyo HT R430 which works great indoors, I have it plugged into an Alexa so you can tell it to turn on and then tell it what you want to listen to and you never have to touch a button. I am installing a pool and a deck outdoors this summer and I would like to put a couple speakers outdoors that are connected to the indoor system so what you are listening to indoors is the same as outdoors. I would like a volume control between the indoor and outdoor speakers so when we are inside the outdoor speakers are off. I would like to put the volume control next to the light switches where my rear sliding door is.\n\nI can do the install, I am just not sure what items to buy that will work together well. I know I will have to chase the wall next to the slider to get the wires up to the volume control. Can I just use an 8 channel receiver, use 6 channels for outdoors and run the other two to the volume control and then the speakers on the deck outside?