The following sound contains piercing high frequencies. I don’t suggest playing it back at at anything higher than a very low volume.
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!
Unearthed Music has made all of 
Recently I have been endowed with a fortunate amount of new gear. After upgrading to 
Lately I’ve been experimenting with iPod Touch applications for recording sound. Generally it’s necessary to use a headset to make a recording, but my goal is to figure out a practical way to bypass the headset with an input for a high quality microphone. While unsuccessfully testing my Audio Technica AT822 stereo mic as an input for the iPod Touch I captured an interesting glitch within the application I was testing. 
After upgrading my G4 to Safari 4.0.2 today, my M-Audio 2496 PCI bus internal sound card started making this horrible sound anytime audio was played on it. My first instinct was to capture the sound so I plugged a cable into my laptop and grabbed a few seconds of it in Audacity. Listen at your own risk. It’s loud and unpleasant, but somehow fun and delightful (reminding me of someone I once dated in the past). Fortunately after reinstalling the drivers it started behaving properly again (unfortunately this technique doesn’t work on partners).