I have tried everything that was suggested on many other forums to be able to RAM Preview Audio.
As I tried all of these solutions, I couldn't hear anything. Then I turned my volume WAY UP and could hear a faint squeaky sound that seemed to match the audio I wanted to hear. For example, when I hit COMMAND and scrub, the squeaky sound speeds up.
My audio is at +0.00db and I have tried this with other audio files and it does the same thing. When I render a Comp, I can hear the audio fine in my .mov file when played back.
I have also tried listening with headphones and with speakers.