Apologies you can (partially) edit offline with the iPad version of X32-Mix,. In the previous version not all the features were editable offline and even in this one, you can't edit the pre-amp gains from the channels, you have to go into the setup screen and do them separately. My app was synced to the mixer before taking it offline and the gains aren't showing their position as they were set on the mixer. So its ok, but not as good as the PC app. Haven't got an android tablet, so can't try out that app.