Such preferred reward systems can help to familiarize a student with cause-and-effect relationships, perhaps on the way to their using switch access for an augmentative and alternative communication device (AAC); in fact, that AAC might even be provided on the same sort of device on which the switch-access training occurred.
For the main screen, themes are restricted to those color sets that provide the best chance of optimizing perception, while the Switchscreen maximizes a whole range of complementary color and brightness contrasts.
The Play/Pause switch can be the Play button, the entire Switchscreen, a switch installed with a wired or wireless interface (sending a 'space' or '1'), or a keyboard (similarly).
"Switch Access Training with Music" is the app version of a switch-accessible cd or cassette tape player with a latch timer (that can be randomized).
SATwM uses a playlist of audio files that you collect from your Media Library (which might include preferred songs, sound effects, conversations, and the like).