Help & Support
Audio separation runs on your device. No account is required.
Getting Started
1. Choose New Project on the Home screen, then select an audio source.
2. Choose your audio and select a range, then tap Start Separation.
3. Adjust each part's volume, mute, solo, EQ, and Pan & Depth. Export as M4A, MP3, or WAV.
4. Use playback speed and A–B looping to practice in both Projects and Sessions.
5. In Sessions, adjust EQ and Pan & Depth for the whole mix. Move between your saved mixes while you practice.
Audio & Processing
If a purchased song is missing in Music, download it from Purchased in the iTunes Store.
Streaming tracks and DRM-protected audio cannot be imported. Use audio you have the rights to use.
Choose a WAV, M4A, MP3, AIFF, CAF, or FLAC file.
Choose a mono or stereo audio file.
Audio files must be no larger than 500 MB each.
Videos must be no larger than 2 GB per file.
On iOS 26 or later, separation can continue while using another app or with the screen locked. Processing may be interrupted depending on device conditions. If background processing is unavailable, keep the app open.
Processing time and storage needs depend on track length and your iPhone. Your device may become warm. Separation may leave residual sounds or affect audio quality.
Buy Full Version
The App is free to download and includes three free successful separations. Each successful save consumes one use, including repeated separations of the same file or a different selected range. Failed or cancelled operations do not consume a use. Previously imported files are not exempt from this rule. Further separations after the free allowance is exhausted require a one-time, non-consumable in-app purchase. The price is the price shown in the App and App Store at the time of purchase. No subscription is offered. Existing projects and sessions remain available for playback, editing and export after the free allowance is exhausted. The allowance does not replenish monthly or reset when projects are deleted. Purchases can be restored within the App. Purchases, restoration and refunds are subject to Apple’s applicable terms and procedures. If a valid purchase is revoked, access to new separations returns to the conditions determined by the free allowance. External destinations and services are subject to their providers’ terms.
Deleting Data
Deleting a project from Projects removes its separated audio, editing data, settings and corresponding project audio. Separately retained imported source audio and previously exported audio are managed separately. Saved audio can be deleted from Sessions. To delete audio, videos and settings stored in the App together, use Delete App in iOS. Offload App keeps app data. Files shared outside the App and existing backups must be deleted at their respective destinations or services. Video projects also retain a copy of the source video so it can be exported again. Videos saved to Photos remain after a project is deleted and can be deleted separately in Photos. Free-allowance records stored in Keychain may remain on the device after the App is deleted. Deleting the App or a project does not guarantee that the free allowance will be reset. Purchase history is managed through your Apple Account and is not erased by deleting the App.
Email Support
Nakayama Works
contact@nakayamaworks.jp
Include your iPhone model, iOS and app versions, the steps you took, and what happened. Do not send audio you do not have rights to or sensitive personal information.