I just picked up a new LG display that I am connected to my haswell rMBP through Thunderbolt. Everything is working great but I can't control the volume of the monitor with the macbook keys, it is all grayed out. I have set up an multi-output device in audio midi setup and so I am getting volume from the monitor and the macbook at the same time for great sound, but I would love to be able to control it from the volume keys on my rMBP. I have googled and tried soundflower but there doesn't seem to be a current app for Mavericks. I can command click on the volume icon and divert back to rMBP to bump volume down, but that is more steps than I need. Any help would be appreciated.