Hi all, I'm brand new here and am looking for some help/advice since I still have a lot to learn before I'll likely be able to return the favor and contribute to this community Anyway, I recently purchased a home that included built-in speakers indoors and outdoors (RCA inputs broken into a few different 'zones'). I've attached a photo of what I discovered the existing inputs are. I don't have an existing home audio system and am leaning towards simplifying things as much as possible (e.g. I'd ideally just like to have a Chromecast audio). I'm less concerned with having control over the zones as I am about just trying to simplify the inputs to something that anyone in the house on WIFI can use (e.g. Casting). My main questions are: Is there an existing cable/adapter solution that might resolve this and allow the use of a Chromecast audio? Or, will I have to overhaul the entire input/setup? Any thoughts or guidance are greatly appreciated. Cheers!