I when through the urc200 on my tv to try to do a macro to mute the speakers. The macro looked like this( tv-menu, down,down, enter,down , down, down, right, down, enter, menu, menu) It was working fine. I have to ask, why don't you just push the mute button. On most tv's the mute is a toggle button but if you pust the vol+ they un-mute. You can build a macro that will always mute the tv ( vol+, delay.5, mute) you are done with the mute macro.