Slowly but surely, YouTube Premium is adding new perks for paying subscribers -- here are the latest features currently in the experimental phase.

YouTube Premium users can now get access to high-quality audio for music videos and better playback controls, including speeds up to 4x.

YouTube Premium subscribers can now step into the lab and enjoy a slate of new experimental features. And the good news is that everything is free to enjoy. Instead of just a single experiment, YouTube has announced you can opt into multiple features at once.

Google is making a couple of new experimental features available for testing for YouTube Premium users today, including high-quality audio (256kbps) for music videos.