I just spent 6 hours trying to get sound to play in AE in Windows 7 with no luck. I tried every common sense thing I could come up with including pressing space bar, and pressing things in the preview pane. Then I read all FAQ's and found out not to use space bar, but to try to scrub audio etc. Then I tried to "change output module settings" but nothing matched with the faq. If it said to do something, it usually didn't exist unless you somehow got to the part they discussed. But eventually I found the checkbox and it didn't help. I tried changing things in the final box when you go to render, to render audio, but that didn't work. I know my computer has all the right hardware/drivers because I have many other sound and video editing programs which work with no problems. I also have ASIO as an option to try. I went into edit-preferences->audio hardware, and the audo output mapping with no luck. I re-installed windows 7 with a clean install after formatting, and set up with the most basic settings and that didn't work either.
Also no matter what I do, I can not get sound to export with the video as AE strips the audio out. In fact I can't get any video effects to export. I tried everything above and nothing helped. I could even at points see the audio waveform in the editor. Plus I know the video has audio. But to make sure I tried 4 or 5 more videos and sometimes in different formats and that didn't work. After spending this much time, I find this pretty counter intuitive given that every other editor like Sony Vegas etc, simply assumes a default that you want to be able to hear the audio track when playing, and assumes if you put effects on, they should render to the output file. Then they give you ways to turn this off. At any rate, I feel pretty stuck at this point. If anyone knows how to get sound within the program, or verify it's working I'd appreciate it. Also a way to export the effects to the output render file would also be useful. Thanks.