Works flawlessly. I have 6 of these controlling the line level inputs to a AudioControl 1250 Whole House Amp. At first, I programmed each one to respond to a different code group and put them all on a common IR pathway. That worked. No problem. Then I decided to put each RGC11 on a discreet IR path by assigning each one to a specific port on my remote control's RF extender Harmony 890Pro Remote. Either way, this unit does what it's supposed to do. You can set volume by sending discreet volume levels 1-6 I believe or by ramping up or down. There's Mute On and Mute Off. I use the Level 3 command when powering up devices. This passes sufficient line level to wake the amp up on a specific channel since the amp automatically powers down each channel when line level activity ceases. These commands are sufficient to control a whole house audio system. I like the RGC11 so much I'm trying to find other uses for it in my system so I can buy more.