Why: http://dodgerhater.blogspot.com/2010/10/say-no-to-buck-mccarver-delay-radio.html
How: http://www.botecomm.com/bote/radio/radiodelay.html (Radio Delay With MLB Gameday Streaming Audio, Virtual Audio Cable method).

Yes, I paid the $20 to MLB for Gameday Audio streaming. I gave up on getting listenable sound from a portable AM radio into the laptop. It sounds fine from the radio, but as soon as it’s connected to the laptop there’s a huge amount of line noise and static. I think it’s coming from the TV equipment and being picked up by the audio cable, but I haven’t found a way to block it.

1. Install and start Virtual Audio Cable.
2. Start Radio Delay with input device set to Virtual Cable 1 and output device set to the computer’s audio device (e.g. SigmaTel Audio, etc).
3. Try playing a sound file on the computer. It should register on the “Input Device” side of Radio Delay, silently, and then playback through the “Output” side with audio.
4. Launch GameDay audio.
5. If the GameDay audio feed is playing without delay, stop and restart Radio Delay.

So far, with quite a bit of head-beating and hair-tearing, this is working. I am waiting for the actual game to start so I can sync audio and video. There’s a sixteen second (!!) delay from KNBR to DirecTV, but I don’t know how much of a delay there will be between GameDay Audio and DirecTV. I’ll update this post later with that information.

Update 1: The delay seems to vary between nine and eighteen seconds, probably because MLB’s Flash audio player seems to stutter, pause and catch up. Unfortunately, changing the buffer in Radio Delay causes the current buffer to be cleared, so it’s difficult to properly sync the audio to video. So far.