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Downloadable mobile applications for controlling the sound volume of videos, audiobooks, music, and alarm clocks; Downloadable mobile applications for boosting system and media volume; Downloadable mobile applications for browsing and playing video content; Downloadable mobile applications for creating, managing, and customizing song playlists; Downloadable mobile applications for controlling music playback on the lock screen and notification bar; Downloadable mobile applications for offline playback of music and video files; Downloadable mobile applications for playing multimedia files in various formats; Downloadable mobile applications for featuring an equalizer with bass boost and reverb effects for audio playback; Downloadable mobile applications for playing video content in pop-up windows, split-screen mode, or background mode; Downloadable software for transmitting, streaming, browsing, organizing, and accessing audio and video content