a very cheap way to acheive local volume control of the ChromeCast Audio’s is to put a Xiaomi button in each room where you want the volume control and code them as volume controls dedicated to the CromeCast for that room (1x Xiaomi Hub also required). They are capable of 3 functions per button (single click, double click and click & hold) or you can create an automation that switches the function on the fly so that the first click and hold slowly increases volume, but if you release and do so again the volume will decrease. (others have done this for light dimming with these switches) This then solves the wife approval issue plus you can use the other unused button functions (single click) to turn a light on and off in that room… or whatever else your imagination desires!
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