iZotope RX
Repair dialogue and recordings with spectral editing and audio cleanup tools
Separate songs into stems and practice with them on Apple devices

Norah Studio separates a song into vocals, drums, and instrumental tracks on a Mac, iPad, or iPhone. Open an audio file, listen to individual parts, and loop a section by bars while you practice or explore an arrangement. Tempo and key controls let you slow a passage or move it into another range, and effects can be applied separately to each track.
The app also provides chord information, melody tools, and export options for processed stems and MIDI. Separation runs on the device without uploading the song, and each device keeps its own library. A free allowance lets you process several songs, with subscription and lifetime options for unlimited use.
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