Is it possible to link an audio file eg. a music track, to an image? Either auto-play or on demand?
Yes, it is! I have a YouTube tutorial video that explains how it is done, and a zip file with examples. You can watch the video here: https://www.youtube.com/watch?v=_UIJyPZPLzc
You might also want to watch the tutorial on how to use audio clips in RAB. https://www.youtube.com/watch?v=VQ7CllAGyNg
It won’t auto-play, but plays back the sound when you tap the image.