Linked audio files in the documents folder can use the Playbar. This is a quick and fast way to control your music. You can turn on the Playbar in the Settings->Global-Functions.
Once the Playbar is turned on, files that have audio attached using the Play Audio File + button or through the Music Controller Link Audio File command will show a slightly darker gray area on the bottom of the screen. You can control playback by tapping and swiping in this area. For example, a single tap will start and stop playback. A double-tap will start from the beginning. List below are the supported taps and swipes.