I don't know about the quietude of the Universe, Pianistimo. There's a lot of tumultous stuff going on - Galaxies colliding, Novas exploding, Quasars and Pulsars beaming, Black Holes roaring...
I think if we were in deep space, the energy coming off all that stuff (and God knows what else) would be impacting our space ship. Wouldn't we hear a cacophony of noise? In the vacuum of of space, there is no noise, I suppose, but with the air in the space ship transforming the energy into sound, maybe we'd hear lots of things.
Do we have an astronomer on Piano Street who will comment?