I am the proud new owner of an ipad retina. Never used apple devices before and quite a novice anyway, but have got an android smartphone. A useful feature on this is the notification sound for an incoming email. I know it's probably a strange question as it seems most people want to silence the sound but I find it useful when the phone is in 'standby' to have a discreet beep to inform me of an awaited email. On the new ipad I can't find anywhere where I can have the sound switched on when the pad is asleep or with the lid closed. It only sound when I open the mail app. Any pointers would be greatly appreciated thanks