Just a scan of the San Andreas radio dial --
How did I do this? I uploaded an MP3 as an attachment to the "clip collection" page on our course wiki (well, first I recorded the track during gameplay, but that's another story). Then I embedded a link to it in this posting.
In your posting, use the "Edit HTML" tab. Here's what the code looks like:
<embed src="URL_of_Audio_File" autostart="false" loop="false" controls="console" height="62" width="144"></embed>
You'll want to replace "URL_of_Audio_File" with the actual URL of your own uploaded file. In this case it was https://wiki.brown.edu/confluence/download/attachments/1443339
For your own clip, it will be this same URL stem https://wiki.brown.edu/confluence/download/attachments/1443339/
with your own filename tacked onto the end. (Of course, you could also use some other URL if your audio clip is hosted somewhere else on the web.)
UPDATE for current classes: Please note that the URL stem will be different for each course. See the course FAQ on the wiki.