I have something similar I developed some months ago.
It's a PCB with motorized pot driver, mute relay, IR Receiver and status LED (which you mount to your front panel). You will need to supply your own remote (Apple or something similar). I can get the motorized pot from RS, but only at 50k values. Alternatively you just find your own motorized pot and plug it in.
Let me know if you want to know more.