If you go into the Finder, then go to your Movies folder, you will find a folder called "MixEmergency". Copy this folder to the Movies folder on your new computer. This folder will contain things such as your MIDI mappings, overlay presets, effect presets, etc. If you also want your other preferences (those which are accessed from MixEmergency's Preferences panel), then you can also copy the file that can be found if you go into the Finder, to your user folder, then into Library -> Preferences -> com.inklen.MixEmergency.plist