Just a quick heads up if you've gone over to ios7 but haven't done a gig since, make sure the iPad can still communicate with the desk as there's a few issues. Last night the Ipad couldn't communicate with the Mackie 1608 which is a big prob with that rig as you can't do anything until it does. Reinstalling the Ap did the trick but it's not the kind of thing you want to have to do there and then. Allan and Heaths QU16 iPad ap (released finally and already updated) seems ok and so does the Presonus but worth checking before you get to the gig
www.2020studios.co.uk
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I love the possibilities opened up by using tablets and smartphones to control our gear but I'd never spend serious money on something that was completely dependent on it to function.