The Virtual app is designed to play high definition video to an external display while still enabling the app to be used to view the timetable, browse upcoming classes or pause, stop and select the next class. This means videos do not play on the iPad screen. Instead, all video AND audio plays out the lightning to HDMI (Apple digital AV) adapter. Please see AV requirements for more information.
If you do not have an external display connected using an Apple digital AV adapter, an error will display on the iPad. 'There is no external screen connected to the device'.