i-score is an intermedia sequencer for the precise and flexible scripting of interactive scenarios.
In contrast to most sequencers, i-score doesn’t produce any media, but controls other environments’ parameters, by creating snapshots and automations, and organizing them in time in a multi-linear way.
Have a look at the video below to get a better insight of how it works:
Download the i-score installer for the Mac. 
Navigate to the Documentation section to get you started.
i-score is developed at LaBRI/SCRIME - Follow i-score on twitter and Facebook