I watched this and it was quite good. Like most documentaries, it did not go into enough depth for me but it was still worthwhile. I know quite a lot about film sound, though, so your mileage may vary.
One thing I did not know is how much influence Barbara Streisand had on film sound through her 1976 movie A Star Is Born. Watching Making Waves made me realize once again how much an underappreciated art is film sound design. And it also had this just amazing sound board in it:
Yes I want that. I don’t care if we need a whole new house for it. I still want it.