How can I playback audio from 3rd party sites?
You can install youtube-dl to playback URLs from every source youtube-dl supports. However, there will be no support for youtube-dl related issues.
Some websites don't allow downloading, so make sure you don't use the bot for those sites.
How does Text-to-Speech (TTS) work? I need an URL for that!
Search the forums for some URLs you can use with the bot. Also, see this page for more information.
Can I download whole playlists from YouTube?
Yes, you can. This requires installing youtube-dl. When creating a new playlist, you have the option to enter a URL from which the playlist will be fetched.
I want to integrate the bot into my website / remote control the bot via script. How can I do that?
How can guests control the bot?
You can bind a bot user to a server group for that (for example: your default guest group) and set the privileges you want the guests to have. The webinterface will however always require a login.