Oh, what the heck. Feel free to try to hear anything going on in these two:
In this recording, I set the built-in mic input volume to the center -- neither loud nor soft. This is recorded in a "quiet" room*, however, so almost all the ambient noise is coming from the computer's fans. (A Macintosh):
called: built-in mic input med vol.aiff
https://app.box.com/s/gxaw9lhcoo5z9tmrt3mo
Same recording, but, using SoundTrack Pro, I boosted the volume so that it would peak at -20db. So there's now some audible white/pink noise:
called: b-in mic inp Hijk.2 -20
https://app.box.com/s/j1mu259u007sjodjhjlp
Because I have the originals of these files on my computer, I can always do a
"negative phase" cancellation test to see if anything has been altered.
I also experimented with boosting the volume all the way to 0db, and then using noise reduction -- just to see what it would sound like. I'm
not going to post this, because there are vaguely-defined artifacts that could inflame the imagination of impressionable souls.
* My "quiet" room is nearly soundproof, but not totally. And also nearly anechoic, but not totally. It's
very quiet, and
very dead, but not up to pro standards of same.