Yes, you can do this - but you'll need to: 1) Start the sample playing, either with the on-screen controls, of via MIDI 2) Map a MIDI Note to the Mix control of the Sample Player (you may need to set this to Analog, in the Advanced mapping options) When you send the MIDI Note "on", MixEmergency will then set the Mix level to 100%, showing your video. When the "off" note is sent, the Mix level should then go back to 0%, hiding the playing sample from view.
