Startup Idea: Theatrical Performance Sound Editing Software

Startup idea to develop a software similar to GarageBand or Audacity, but better outfitted for the unique requirements of theater performances. Features should include advanced control over sound cues such as automation of fade-ins and fade-outs, auto-volume balancing and more.

I do sound design for theatrical productions. The software QLab is good for putting together existing sound cues, but there's no way to edit cues in a way that makes them conducive to performance without using external programs. If there was a software that worked like GarageBand or Audacity, but was specifically designed from the ground up for theater performances, it would be extremely helpful for me. Just a few things like the ability to freely control the curves for fade-ins and fade-outs, or a way to auto-balance volumes, would mean the world.