YouTube said Wednesday that it is adding new experimental features for Premium users, including high-quality audio, a faster playback speed option on mobile, and the ability to “jump ahead” on the web to skip to the more intriguing part of the video. The company routinely tests new features that users can activate from youtube.com/new. The company said users can now enable an experimental feature that lets them listen to music videos with a higher audio bitrate — up to 256kbps. As a reminder, Yo...