Maybe your iPod player is iPod Shuffle. The device does not support iPod Shuffle.
The device can support iPod players with 30-pin dock connector as the following:
20GB, 40GB, 20/30GB Photo, 40/60GB Photo, 30GB Video, 60GB/80 Video, Mini, Nano 1st / 2nd/3rd generation, iPod 5th generation (video), iPod touch and iPod classic.
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