I purchased the schosche FM-Mod02 FM Modulator to play audiobooks through my car radio with my Sansa Fuze. I had two problems with the modulator. First, The volume level was decreased by the modulator so that even with full volume on my Fuze my quieter Audio Books were hard to hear and I had to turn the volume on my radio way up. Second, I could not charge my fuze while listening because of a serious ground loop problem, as soon as I plugged power in all you would hear is a buzz. I ended up buying the Peripheral PLD10 10X RCA Signal Booster and installing it as well to get the volume level back up and get ground loop isolation. With the volume set correctly on the signal booster my mp3 player at 75% volume has higher volume than my normal radio stations. The ground loop problem completely went away and I can charge my player and listen to it at the same time with absolutely no sound loss. I absolutely love the modulator with the configuration I now have but it would have been nice if it had its own ground loop isolation and had a better volume output.