: Most of these apps cannot process files protected by Digital Rights Management (DRM), such as those downloaded directly from Apple Music or Spotify.
: This tool includes a "Video view" with zoom support, making it ideal for musicians who need to watch a performer's hands while slowing down or shifting the pitch of an MP4 tutorial. Ptch Music mp4
Several highly-rated apps offer these features for MP4 and various audio formats: : Most of these apps cannot process files
: Shifting pitch significantly (especially lower) can sometimes lead to "choppy" or "laggy" audio. Ptch Music mp4