I am catching up on past episodes of On The Media and I just listened to this six-minute segment from the 17 December 2010 show, in which Bob Garfield interviews Elizabeth Williamson of the WSJ about the story she had co-written two weeks earlier on the then-looming passage of the CALM Act:
That's the Commercial Advertisement Loudness Mitigation Act, but you probably already figured that out. President Obama signed it into law 15 December 2010.
Apparently, it won't be enforced for another year (because commercial makers have forgotten how to turn things down?), so keep those mute buttons handy.