Mode and Styles Modes can be changed from either the default or tach mode. The default mode shows blocks of words on a horizontal scroll basis which allows the user to simulate a book. Tach mode was a feature the military used to flash air planes across the screen. In this mode the words stay on a single line and do not move like flash cards. Styles are hotkeys for increasing or decreasing Words and Lines per block. Use these options to change the way you read fast and easy.