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Poweramp のフォーラムの説明

Shuffle Songs will shuffle all the songs in the current category (such as a Playlist, or Album, or Folder, depending on what mode you are listening in). When finished, it will move on to the next category in regular order (such as next playlist, album or folder) and play that shuffled too.

Shuffle Categories will play songs in regular order, and once finished it moves to a new random category and plays the songs from that in regular order.

Shuffle Songs/Categories will shuffle all the songs in the current category, and when finished it will pick a new category at random and play that shuffled too.