To control MixEmergency from Scratch Live:
Controlling MixEmergency from Scratch Live is as easy as loading videos in Scratch Live, or dragging Quartz Compositions onto MixEmergency and linking them to the currently loaded audio file in Scratch Live.
Note: If you're not using Scratch Live 2.3.3 or higher, then to import videos into your Scratch Live library you need to download and install the demo version of Video-SL and check "enable Video-SL plugin" in the plugins tab of Scratch Live's setup screen.