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The tutorial that you are watching is misleading you.
The audio-only preview is the decimal key on the numeric keypad, not the period key.
There are a _LOT_ of terrible tutorials for After Effects, most on YouTube.
Stop watching those tutorials and watch some that are vetted by us as being of high quality:
Details about previewing audio and video are in After Effects Help, here:
Thank you very much. Actually I was watching Lynda.com Tutorial.
Which one, specifically? If there's a tutorial there that is telling you that the period key plays sound, then I need to get them to correct it.
OK I found out the issue, It Is the period key on the the numeric key-pad not on the period key on the actual keyboard.
The Instructor has done a great job teaching, and I learned a lot from him.
I think you can see the Transcript also..