I have been playing with the alarms and can see that they are quite powerful, one question though.
Pronunciation of English alarms has always been an issue when speaking in technical terms, sometimes its nice to be able to play the voice alarm back to hear what its going to sound like and tweak the phonetic spelling to suit your particular requirements.
I suggest either a notification block in the pipeline that sends the audio stream to your speakers or a similar test notification page from the gateway console that can send dummy alarms and have them play back.
I guess if you had the notification block that sent them to speakers it could be used for testing as well as an actual computer that speaks out alarms while they are active.
Perhaps one day you could even extend this idea to make a computer (client) running ignition an entry in the roster so that you could send spoken / audible alerts to it and alert people in the area.
For now just a way to test what the TTS sounds like speaking my particular alarm would be great though!