There is Sound - Un-mute button
Initial report was my disappointment with no sound on the app but after going to the apps website I found that I needed to un-mute my sound (Note: not the volume button on the side but the actual mute button. iOS 7, slide up from bottom and select the “Chime/bell” symbol) Although other audio plays from my iPad with with the mute button on I did not think the iPad was muted.
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Daniel Tiger’s Day & Night