I have a Mi box S and would like to know is there a remote that can control the Android box and my sound bar? I can't find anyone else trying to do this and the explanations of the popular G20 remote shows it pairing with a tv but not a sound bar or tell if volume buttons can be programmed. Soundbar is IR via optical out so no arc.
Try the newer Amazon fire TV remote w/ power & volume controls. I have mine programmed to my TV & AV receiver and paired with my Shield. Buy it with the fire stick as you will need that to program the remote. I bought mine when they had the sale for $24.99.
Edit: the power button turns on/off both TV & receiver, and I have volume control set to the receiver. Both TV & receiver are IR.