I've done this mod now for several of the inmates here. A couple of them have posted back to the original mod posting here: http://www.advrider.com/forums/showp...6&postcount=53
I have had questions about the ear buds and setup that I use. I tried using ear buds last year once and gave up on it because the buds I had pressed on the padding inside the helmet and irritated my ears. After I did this mod I got a new set of ear buds from cyclebots.com, the S-Plug ear buds. They are very soft and pliable and fit inside the ear so they don't rub or irritate your ears. I have worn them for 16 hours straight with total comfort. I also have a friend that wears them all the time, he has run in 2 Iron Butt Rallies (11 days, 11,000 miles).
The plugup.com website has a volume control extension cable that can be used as well to take care of the increase in volume when using ear buds. http://www.plugup.com/volume_control..._p/ad%20vc.htm
If you purchase the S-Plug ear buds in the 22" length (short) and use this extension to cut down the volume you can then use the G4 normally. The S-Plugs can also be found on the same website: http://www.plugup.com/the_S_plug_ear...22-3.5-4.5.htm