Stems & MIDI in an Android app

Remove vocals, split music into separate stems, and create MIDI from audio — right on Android.

Promus is a neural-network app for audio separation and MIDI. Upload tracks, get isolated stems, detect tempo and key, and create MIDI parts for drums, bass, guitar, and piano.

Features

Everything you need to work with a track

From vocals and stems to MIDI and export.

Vocals & instrumentals

Make karaoke versions, pull an acapella, or keep only the instrumental. Separate backing-vocal extraction is available.

  • Vocals + instrumental
  • Vocals + backing vocals + instrumental
  • A quick instrumental for practice or covers
Vocals and instrumental mixer
Vocals, backing vocals, and instrumental

Stem separation

Choose how deep to split — from a fast instrumental to a full instrument and drum breakdown.

  • Vocals + instrumental
  • Vocals + backing vocals + instrumental
  • Vocals, drums, bass, and the rest
  • Full split: vocals, drums, bass, guitar, piano
  • Detailed drums: kick, snare, toms, hi-hat, cymbals
Stem separation
Instrument stems
Detailed drums

MIDI by instrument

Separate MIDI files for drums, bass, guitar, and piano — not one file for the whole track. Preview MIDI against the original in the app before export.

  • Per-instrument transcription
  • Listen to MIDI next to the original
  • A base for arrangements and beats
Drums MIDI
Bass MIDI
Guitar MIDI
Piano MIDI

Flexible export

Download individual stems or bounce them to one file. Share the result right from the app.

  • Formats: MP3, WAV, FLAC, M4A, OGG, AAC
  • Bitrate: 192, 256, or 320 kbps
  • MIDI — per track or all at once
Stem export settings
Export MIDI

Process

How it works

From upload to export usually takes a few minutes. Processing runs on our servers; you preview the result in the app.

01

Upload a track

An audio file from your phone or a track link. Supports MP3, WAV, FLAC, and more.

02

Choose a mode

Instrumental, stems at the depth you need, or MIDI — pick what fits the job.

03

Preview the mix

Stem levels, loop, speed, and pitch shift. BPM and key are detected automatically.

04

Export

Separate stems, a bounce, or per-instrument MIDI — in the format you need.

Balance

Minutes

Minutes are charged by track length when you process. You can preview results on the free balance.

20 free minutes

Every new user gets 20 free minutes. You can split files into stems, create MIDI parts, and listen in the app to judge the neural-net quality before buying. Minute packs unlock downloading (exporting) audio and MIDI, and let you use paid time to process and download new tracks.

New users get 20 free minutes: stems, MIDI, and in-app listening. Minute packs unlock audio and MIDI export.

Get on RuStore

Google Play — coming soon

Get on RuStore

Google Play — coming soon