20. How to create the inner playlists on X1 2nd gen?

A: When playing a track, press shortcut key(upper left on the wheel) to enable the shortcut menu bar. Click the second icon "⊕" to add the track to an existed playlist or create a new playlist then add to it.
In the Playlists screen, if you want to delete a playlist, first select the playlist by scrolling the wheel or pressing the previous/next button. Then press the shortcut button briefly, and a dustbin icon will appear. After that, press the OK button to delete it. Similarly, you can remove a certain track from a playlist by doing so. Doing this will only remove the track from a certain playlist, not delete it from the micro SD card.