iPod Touch not working with speaker dock

At the moment I've been having problems with my speaker dock. Its a Goodmans clock radio and I've always been able to play my music from my touch through it. Yesterday I tried it but now no music comes from the actual speakers. I assumed it might be a bad connector on my touch but it's still charging perfectly by being in the dock so it can't be that. I also tried it on another speaker dock of a different make in case that was a problem but again there's no sound coming through the speakers just throught the actual ipod. Is there any way I could have accidently changed the settings on my ipod or is anyone else getting this problem ?