Sound in backround-windows

Hello!

I have a Question about mulriboxing in wow. I have a macro witch is permanently pressed on each char to farm a specific mob . When that mob appears the macro unmutes the sound of wow and plays a loud soundfile("Be quick or be dead" from iron maiden )

The macro works perfectly, BUT when the mob spawns in one of the backround-windows i can not hear the sound. How can i manage to hear the sound of EVERY window at the same time ?

[lax]

ISBoxer has an option for it in your Character Set, but it's disabled by default.

WoW has an option for this in the in-game settings, that's probably what you're looking for