ipod touch will not play through dock speakers

i just got an ipod touch yesterday, and whenever i try to play my music through my memorex "made for ipod" dock, the music will only play through the ipod touch speakers. the dock reads that an ipod is connected, and the battery will charge on the ipod touch, but it will not play through the dock speakers. i don't think the problem is with the dock, as it will charge and play the music on my ipod classic. how do i fix this connection???