Hi, it is possbile to record audio from microhphone.
You can use Audacity and a lot of sound recorders to record audio from websites and then upload to a server.
When you choose to record audio with Audacity or other, first you need to install software, second set the recording channel on its interface, third play audio on microphone, fourth record it.
As for how to save it as .swf, you may need an audio converter.
Late to answer but hope it is useful.
I don't think he's looking to record audio from the web but rather let individuals record audio into a swf and then have it all accumulate on a server.
I think it's a two-fold challenge - use the microphone class to record and then perhaps the filereference class to move it up to the server?
Here is a tutorial to know about microphone class:
and here is a tutorial on creating and recording a audio recorder app:
If you want to record web radio, audio or any sound you like, you need turn to have some aid of tech soft. Are you good with tech soft, if not too familiar with those one, you can refer to audacity, adobe audition4, windows media player etc. All these will tell you how to record web radio and other sound coming from your computer.