Controlling audio doesn't seem like a perfect use case at all. When you control volume you usually want to make it quiet and stay quiet - e.g. someone is sleep

Controlling audio doesn't seem like a perfect use case at all. When you control volume you usually want to make it quiet and stay quiet - e.g. someone is sleeping but you want to continue working (moving) and you don't want to accidentally turn it back up. The other time when you control volume is when you want to make it louder and then dance (moving) and you don't want the volume to jump up and down. Only other case that I can think of is when you want to turn the volume up or down just a tiny bit, which actually seems like the worst use case for this technology.