If you have Quartz Composer, you can open the composition, find the Syphon patch, and go to the Patch Inspector. In there should be two text fields that you can use to identify the Syphon feed. I can't check exactly what it is for MixEmergency - but the first should be "MixEmergency", and the second should be "Output" (or something like this). You should be able to read the actual values from the Syphon client application.