Unfortunately the Akai AMX isn't capable of recording direclty via the USB connection. Because of this, you will either need to: 1) If you have an older Mac with an audio-input, connect the Output of your Akai AMX to the line-in input 2) Record via a secondary audio-interface (again, connected to the Output of your Akai AMX) 3) Record within Serato DJ, and then line up the recording afterwards in a video editor and export it from this (or, if you know a bit about video formats/applications, you may be able to substitute the audio directly into the video container)