Open Fraps. Hit the 'movies' tab on the top. Check "record sound" box. Go into halo or w/e,Turn halo volume to 0.Then everything you hear will be recorded when you record a video (i.e. ventrilo or w.e.t.f). I used it on you guys and made you all sound like chipmunks.
It's the poor man's way to do it, since online voice recorders require trials and membership