How does one add audio files such as .wav other thsn the provided music library to slide show?
Click on the "Browser" tab near the top of the program then click on the 'computer' icon that shows up just below that tab. You should be able to navigate through the folders on the system to locate those WAV (and other) audio files. Once they're listed in the browser, just drag-and-drop them into your show. It's also possible to drag audio (and other) files into a show from a normal Windows folder (outside of Photopia).
If this process should prove to be problematic, please reach out through our Contact Us form and we'll be happy to help further.