volume related issues

tower: https://tower.im/projects/d4e0ff64158645f28d99a9ca72d0c27b/todos/a893d8f7593f42fe9ffcb01b08fd2649/
1, volume&muted bindings
2, muted setting problem

Change-Id: I71368a7cf9de4f052ce208b8c4824fc733562083