Peff never ceases to amaze me with his Reason chops. Here he is using audio as a control voltage to trigger the playback of a Quicktime Movie clip:
"Using an audio as control voltage configuration, Reason triggers the playback of a quicktime movie. I needed to mix to a film scene and developed this patch as a workaround of relying on a rewire host application that supports video.
Using Reason CV as audio, this configuration only acts as a video sample playback system, so the video playback is only triggered by Reason and not synchronized to the transport. A gate impulse on a Reason audio track is routed to max/msp and initiates a jump to a particular frame." -Peff