Is there an adapter that can be used with the ipod docking station if you have a case on your phone?

I have an ipod and an iphone 4 with a docking station that is compatible to both. For Christmas I got a survivor case and it will not work with the docking station. Is there an adapter that will allow you to use them interchangeably without taking the case off every time. I saw the 30 ping adapter but all it talks about is using for games and movies, will it work for my situation? Thank you and have a great day!

iPad

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