To add an audio file to a template, Content → New → Media, and upload the mp3 to your library. The mp3 file then becomes available to add to any template via the Media library.
You can also group individual mp3 files into an InfoVue playlist, and use that playlist in a template.
If you want continuous audio running behind a series of templates, you can tap into Internet radio streams (with the proper permissions, of course) and use these as background music for InfoVue templates.
If you want a streaming audio source that will stop playing when a video with sound comes up in your InfoVue playlist, you have to add that audio source as a “video stream” in your InfoVue content library, and then add that stream to each template. A stream will run continuously across several templates as long as the “video stream” element is included in the design of each template in the series.
To add an Internet radio stream, Content → New → Video Stream. That video stream becomes a piece of media that you can drag on to your template. You will want to resize that zone so that you can hide it behind some other element on your template, or else the Internet player will be visible.
If you’re using an analog audio source such as a radio station signal, an iPod, or set-top box, you can connect the source to the InfoVue player with a USB audio dongle.
If you plan to use the audio stream as an uninterrupted source, TelVue can configure your InfoVue with the audio source during the installation process. This audio stream will run continuously, even if you have some other video with audio in your playlist.