Another bulge-watcher has just made the "second voice" audio excerpt from debate three more easily available. Listen for yourself
here.
My reaction? Intrigued, but not persuaded. A mystery voice is definitely there -- you can hear it most prominently at about the two minute mark. You don't hear this oddity when Kerry or the moderator speaks. And in these days of digital recordings, I would hesitate to ascribe this phenomenon to the "pre-echo" that we used to hear in old-fashioned oxide tape.
That said: Provenance of this audio excerpt remains a question. We do not hear this mystery voice on the CSPAN feed. If this audio was picked up from a broadcast source, there may have been some bleed from a nearby station.
Beyond
that, listen once more to the cadence of Bush's speaking style. Phrase...
pause...phrase...
pause. Isn't this bizarre verbal behavior evidence in and of itself? Especially with the "mystery voice" phenomenon buzzing subtly in the background, the listener cannot escape the impression that Bush is receiving cues from afar.
Also, you can see
here the video of Bush appearing to adjust his earpiece. (Yet another site devoted to this controversy!)