Hey Amplant, did you know you don't need to cast from your handheld to the Max or speaker? iHeart radio is a service that you can simply say Hey G, listen to WXYZ on iHeart Radio and it should play. Keep in mind, not all radio stations allow use on the speakers and restrict use to handheld devices. Try it and see how it works -- Tune-in works that way as well. Not sure why that is, but it is -- it probably has something to do with payment for rebroadcast or repurposing.
