I'm looking for a solution to this problem: When I'm working at my computer, sometimes I'll be using noise-isolation headphones connected to a source other than my computer (e.g., an iPod). I would like to see (this is what I mean by "visualize") some kind of notification on my screen, since I will not be able to hear the sound.
Is there any software out there that would accomplish this? I'm interested in seeing any sounds that would normally come out of th sound card.
This is for Windows (XP), but I'd be interested in hearing solutions for other flavors, and OS X, as well.