Not sure the easiest way to explain this.
When we play live we use tracks for synths, BGVS and some percussion. Near our computer, we have an LPD8 that has a button mapped to FADE tracks out. We use this in the event that the tracks mess up mainly or some instances where we play the songs quieter.
Would it be possible to create a button that we can map to something in ableton or build this feature into the plugin. So the person controlling the tablet can have this capability also.