I've been looking for software that goes beyond eliminating stray noise. For inexpensive and simple production of new footage I've wanted to find something that would enable the actors to record their rehearsals on set or a mock-up of the set or location, select the best of the bunch, and then play it during filming. the actors, with a little practice, could follow along speaking their lines a fraction of a second behind. They could concentrate on other things like hitting their marks. The audio would be cut into fractions of certain frequecies just enough to be understood. The software would remove those certain frequencies and perhaps fill in for desired audio on those frequencies that were removed. The new tracks could be digitally processed to improve voices and elimanate noise to keep new audio to a minimum in post.