This sound was produced accidentally after starting up Live and opening a recent document on my new MacBook Pro. A couple of tracks were record enabled and the input settings reverted to the default because Live 8 did not know about my external sound card yet. Luckily my MacBook Pro’s audio out was not plugged into my mixer, so the sound was only amplified through the internal speakers.
Naturally, my first inclination was to capture the feedback. My second was to try and control it by cupping the mic hidden under the left hand speaker grill. I had some success doing this. For now here’s the original feedback.
Playback With Caution!