http://www.youtube.com/watch?v=VjvmGSaTLWM
The State Fair Park P-50 failed to activate, but other sirens in Milwaukee, Wauwatosa and West Allis can be heard. Also, Elm Grove, WI's T-121's are heard testing after Milwaukee County's test ends.
Only a portion of Milwaukee County's Sirens activated for this test. The reaons behind this particular test are unknown, but Milwaukee County EM now has the option to activate sirens in specific areas as opposed to the eitire system. It seemed to be only sirens in the far Western portion of the county that were activated for this test. I was rather disappointed, myself.