Make the track fit
your practice.

Change the speed and key of your own local audio independently. Save named variations and take the transformed audio with you.

Practice at your pace

50–150% speed, −12 to +12 semitones, a source range of at least 0.1 seconds, and −18 to 0 dB output gain. Render before auditioning or exporting. Time stretch and pitch shift are real audio effects; changed settings require a new render. Repeat playback of the rendered audio if useful.

Keep your versions

Local source copies, track names and named variations stay in the device library. Reopen and rename tracks; load, rename and delete variations. An optional original synth study is generated locally and clearly labeled as an example. Share a 48 kHz, 16-bit PCM WAV or a ZIP with that audio, Settings.csv, Settings.json and Readme.txt. Packages contain results and settings, not original audio or an editable backup.

Limits

Local WAV, AIFF, M4A or MP3 when decodable by iOS; mono or stereo; 0.1 seconds to 5 minutes; 160 MB per file; 20 tracks, 30 variations per track, and 1 GB library. Output duration follows the source range and chosen speed. Effects may introduce artifacts or clipping; audition the result. No streaming-service or DRM import, recording, key detection, stem separation, transcription, MIDI editing or performance scoring.

Support

Email maga40@naver.com with the app version, device, source format and length, and the action that failed. Send audio only if you intentionally choose to and have the right to share it.

Privacy policy

Effective October 1, 2026. Gobling Company provides Tembry. No account, ads, analytics, tracking or third-party data SDK. The app does not collect or transmit source audio, names, settings, variations or rendered files to a developer server. Import, processing and storage run locally.

Only the file you select in the system Files picker is imported. The app retains a source copy, source format information, waveform envelope, track name and variation settings in its local library. It does not request microphone access.

System sharing sends only the WAV or package you choose to your selected destination. Packages contain the track name, selected range, processing settings and finished audio. Review them before sharing; destinations have their own privacy practices.

Swipe to delete a track in Saved tracks to remove its app-local source, settings and renders. Uninstalling removes local app data. Already exported files remain at their destinations and must be deleted there. Device backups may include app-local data according to Apple or computer settings.

Support receives information you choose to email. Website visits make ordinary requests to the hosting provider. Neither is required for local audio processing.

Terms of use

Process and distribute only audio you have the right to use. Keep original files separately and check the rendered result. No guarantee of artifact-free or lossless transformation, musical accuracy, or compatibility with every encoded audio file. One upfront purchase through the App Store; App Store terms and applicable law govern purchases.