I have an older Merlin Legend system (not sure which release). I just installed a loudspeaker system for one of our zones. I used a Bogen TPU-35B and a couple horns to accomplish this, and it works great. I was wondering if its possible, either with existing equipment or otherwise, if we can page all phones (MLX-10DP) AND the loudspeaker simultaneously with 1 button? FYI, I'm a phone novice. Thanks in advance.