Music Slow Downer: Karaoke

Music Slow Downer is a practice tool for musicians and music students: slow a song down without changing its pitch, change its key and loop the hard parts. Now you can also remove the vocals for a karaoke backing track, and turn the drums, bass and other instruments up or down one by one. VOCAL REMOVER AND KARAOKE • Split a track into four stems: vocals, drums, bass and other. The AI model runs entirely on your device; nothing is uploaded. • Remove the vocals and sing over the backing track, or solo the vocals to work out the lyrics. • Set each stem's volume; mute (M) and solo (S). • Karaoke, No drums and Vocals only presets; speed, pitch and loops keep working on separated tracks. • Separate any track in your library, a song you pick in the Files app, or a track you download from a file link. • Separated stems are saved, so the track is ready next time. (iOS 16 or later) SPEED AND PITCH ARE INDEPENDENT • Slow down or speed up between 20 % and 200 %; the tuning stays the same. • Transpose by up to ±12 semitones; the tempo does not change. • Hold a slider knob and drag your finger down: precision goes all the way to 0.01. • Left/right channel mix lets you bring an instrument forward or push it back. A–B LOOP • The |◀ and ▶| buttons set the loop start/end at the current position; only that section plays. • The waveform timeline spans exactly the loop range. • Name and save loops, step through them, export/import them as JSON. • Pause between repeats and "stop after N repeats" options. LIBRARY • Add audio and video from the Files app or the share sheet (mp3, m4a, wav, aiff, flac, mp4, mov). • Download from a direct file link. • Organize with folders; every track remembers its own speed, pitch, loops and stem mix. • Videos slow down in sync with the audio; tap the preview to watch full screen. EXPORT • Save the track, or just the loop range, with the current speed, pitch and stem mix as M4A or WAV and share it. Turn your karaoke backing track into a file in one tap. TOOLS • Metronome (10–600 BPM, 10 sounds) runs alongside the player. • Tuner with letter or solfège note names and an adjustable A4 reference. PRIVACY • No account, no ads, no data collection. Your files and the separation stay on your device. Background playback and lock-screen controls are supported. Designed for iPhone and iPad.