LSScrubbing lets you skip to any point in a song from the lock screen
When your iPhone is locked, and you double-click the Home button, it gives you quick access to music playback controls from the lock screen. You can forward, rewind or pause a song and also adjust the volume.
Unfortunately, due to the lack of a scrubber bar there is no way to skip to any point in a song. You’ve no choice but to unlock your iPhone, launch the Music app and drag the playhead along the scrubber bar to skip to that point in a song.
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