I normally use AE CS4 and to preview Audio I just have to press the "RAM Preview" button and it reproduces audio. I´ve tryed the same on AE 7.0 but it doesn´t work.
Is there any other way to preview Audio on the timeline?
Is t maybe a setting I have to change in order to preview audio?
If I remember well, pressing "." on the numeric pad will play all audio in real time (actually as much as you have it setup in prefs) and hitting the "*" key will set markers.
If you want to preview audio with video in RAM preview, just make sure the speaker icon is not deselected.