Volume Times Two:

Calm down. This is not a quiz to see how much geometry you remember. This is about your iPad remembering. Your iPad will retain two different volume settings – one for a connected headset and one for the onboard speaker. You’ll almost always have the speaker volume setting higher than that of earbuds or a headset. So, when you switch from speaker to earbuds, this thoughtful feature helps make sure your eardrums don’t get a sonic surprise.

Excerpt from my eBook iPad Academy: Tips, Tricks and Clever Techniques.