Ok, those of you with sound issues here is what you need to do:
On your iPad: go to SETTINGS>GENERAL>USE SIDE SWITCH TO
and set it to MUTE.
Then toggle the MUTE switch on the iPad to make sure you are not muted.
Having this function set improperly will not mute your whole iPad (you can still play some Apps and listen to music etc).
You are basically just defining the behavior for the mute toggle on the side of your iPad.