What is a custom URL and how can I add it to Sonos?

The Custom URL feature allows you to listen to a private streaming URL, most likely not in the TuneIn directory, using the TuneIn and Sonos app.

To add a custom URL to your Sonos:

1. Ensure that TuneIn (new) is added on your Sonos app
2. Log into the iOS or Android TuneIn app using the same TuneIn credentials you use on Sonos
3. On the TuneIn app, navigate to Library
4. Tap on customURL and enter the desired stream URL
5. While listening to that stream, tap the favorite (heart) icon on the now playing screen
6. Select “favorite station” 
7. Enter a name for the custom stream
8. Return to TuneIn (new) on your Sonos app, and you should now see that station in your favorites gallery there.