Set MixEmergency's external control selector to Serato DJ / Scratch Live (this is set to Serato DJ / Scratch Live by default)
Check that the external control indicator is colored green
Controlling MixEmergency from Serato DJ is as easy as loading videos in Serato DJ, or dragging Quartz Compositions onto MixEmergency and linking them to the currently loaded audio file in Serato DJ.
Minimum Requirements - Mac computer - macOS 12.4 - Scratch Live 1.9.2, Serato DJ 1.6, or Serato DJ Pro