このアプリについて
ピッチ、テンポ、声の質質（フォルマント）をそれぞれ独立して自由に変更できる、高機能な音声編集・プレイヤーアプリです。
再生速度や音程を変えても、ベース音の自動補正やアタック音の鮮明化技術により、音質を保ったまま快適にリスニング可能。センターキャンセルによるボーカル抽出・除去、5セント単位の超微細な音程調整、部分的なピッチ補正まで対応しています。範囲指定ループや練習設定の保存も完備し、楽器の耳コピから語学学習、ダンス練習まで100%ローカル駆動の安全な環境で強力にサポートします。
ボイスチェンジャー
高精度なデジタル信号処理（DSP）技術により、音質劣化のないクリアな音響体験を実現。
フォルマント
複雑なオーディオ解析やエフェクト処理を、直感的なインターフェースでスマートに操作。
音程補正
練習や制作、リスニングなど、音楽を楽しむあらゆるシーンを強力にサポートする機能群。
ボーカル除去
低レイテンシー処理と高度な音響設計で、プロフェッショナルから趣味まで満足のいく品質。
About This App
■ Basic Features (Pitch, Tempo & Formant): 100% FREE, with no full-screen ads during standard use. Adjust Pitch, Tempo, and Formant directly from the main-screen sliders.
■ Advanced Options: Also 100% FREE. Occasional full-screen ads may appear only when opening advanced settings. Permanent ad removal is available with a small one-time purchase.
This audio & video speed changer and pitch shifter lets you import MP4, MKV, WAV, and MP3 files, extract audio for waveform editing, and play or export as MP3/WAV while independently adjusting Pitch, Tempo, and Formant.
With A-B looping, playback marking, waveform editing, and vocal processing, it is ideal for music transcription, vocal practice, dance routines, language learning, and audio analysis.
https://docs.google.com/presentation/d/1-CiSm_HoQ2uj7i5kC6GYXp-t2trgR2VpggGeFxr0b3Q/preview
● RECOMMENDED FOR
・Musicians & Transcribers: Slow down fast solos, change keys for vocal covers, isolate instruments, and practice ear training.
・Singers & Vocalists: Transpose backing tracks to your vocal range, practice karaoke, and change vocal character with formant shifting.
・Dancers & Choreographers: Slow down video audio to practice dance steps and choreography.
・Language Learners & Students: Adjust speech speed for listening practice, dictation, podcasts, and audiobooks without changing pitch.
● AUDIO QUALITY & CORE FEATURES
・Wide Range: 25%–400% tempo and ±1 octave pitch adjustment.
・Three Core Sliders: Pitch, Tempo, and Formant are available directly on the main screen.
・Video Import: Import MP4/MKV, extract audio, edit Pitch/Tempo/Formant, and export as MP3/WAV—no separate converter required.
・Automatic Frequency Compensation: Restores weak bass on pitch-up and thin treble on pitch-down.
・Attack Clarity Enhancement: Suppresses "doubling" artifacts on drum and percussion attacks.
・Flexible Export: Lossless WAV or MP3 at 96–320 kbps.
● ADVANCED VOCAL & FORMANT ENGINE
Our C++-powered DSP engine provides detailed control over vocal character while maintaining natural-sounding results.
・Natural Formant Shift: Change vocal character and perceived voice characteristics without changing pitch.
・Voice Texture (Cepstral): Adjust envelope resolution, with Auto available.
・Vocal Cavity Protection: Prevents unnatural vocal tract and mouth scaling during formant shifts, reducing "giant mouth" artifacts.
・Cepstral Envelope Fade: Smooths spectral peak transitions.
・High-Frequency Protection: Prevents excessive processing of breath sounds and cymbals.
・Low-Energy Frame Bypass: Skips quiet frames to prevent background noise amplification.
・Pitch Protection: Prevents melody breakdown from unnatural high-frequency pitch or harmonic shifts. (2026/8 new!)
● PRACTICE & EDITING TOOLS
・Vocal Remover & Extractor: Center-channel cancellation to remove or isolate lead vocals. Results depend on the source.
・Track Decomposition: Isolate sounds based on stereo positioning.
・Micro-Pitch / Micro-Formant: 1-cent (1/100 semitone) precision for tape/vinyl drift, instrument tuning, and microtonal adjustments.(2026/10//6 update!)
・High-Quality Mode: Phase Vocoder processing for clearer time-stretching and richer harmonic detail.
・Spot Pitch Correction: Correct pitch only in selected waveform areas.
Guide: https://youtube.com/shorts/I1BFM18fjDw
・Practice Session Save: Save loop points, bookmarks, presets, and song-specific settings.
Professional audio processing on mobile—no DAW required.
● 100% LOCAL PROCESSING & PRIVACY
All audio and video processing is performed locally on your device. Your media files are not uploaded to a server for processing.
Try our lightweight spin-off, "Pitch Tempo Changer Flash"—designed for instant playback, background listening, and multiple setlists without complex editing.
Special thanks to Mostafiz for the beautiful app icon!
Voice Changer
Powered by high-precision digital signal processing (DSP) to deliver clean, uncompromised audio.
Formant Shifter
Manage complex audio analysis and effects processing effortlessly with an intuitive interface.
Pitch Shift
A robust suite of features to support practice, production, listening, and all music activities.
Vocal Remover
Combines low-latency processing with advanced acoustics to satisfy both hobbyists and professionals.
デモンストレーション
アプリの主要な機能や実際の操作感を動画でチェック。
Demonstration
Check out the core features and user experience of the app in action.
ユーザーガイド & 使い方
詳しい設定や操作手順については、以下のスライド説明書をご覧ください。
User Guide & Instructions
For detailed settings and operation procedures, please refer to the slides below.
更新履歴
微分音補正(ピッチ・フォルマント)のステップを、5セントから1セントにしました。
クリップ防止が暴れてブツブツとしたノイズが乗るのを抑制しました。
ボーカル抽出・除去の精度を向上しました
標準モードに限り、スライダーにリアルタイム反映に対応しました！ フォルマントもスライダーにリアルタイムで反応します！！！（HQモードは重い処理を挟むので難しいです。） 細かい不具合はこれから出るかもしれないですが、都度対応していきますので、是非ご意見お寄せください！！
R8解析を使用し、アプリのサイズやメモリ使用を最適化しました。
ユーザー様のご意見を受けてフェーズボコーダーエンジンを大規模強化しました。 HQモードの音のザラツキが消え、金属のようなノイズがかなり改善されたと思います。 本当に感謝！ ※現状はこのアプリのみ。flashには別途デバイス負荷との兼ね合いで音質改善を継続してまいります。
フォルマントシフト機能を強化。 ケプストラム領域にピッチが立ち入りそうになった時、緊急的に「ピッチはここまで来てるよ！ケプストラム係数もっと下げて！！」と調整します。
フォルマントシフト機能を基本機能へ昇格させました！！ これにより、広告なしで「ピッチ・テンポ・フォルマント」のシフトが可能になります。 但し、細かい音質設定は広告が流れます。 ホントは10000ダウンロードで昇格させるつもりだったんですけど・・・・勢いでまあ・・・
動画ファイルも読み込むことができるようになりました。
女声を男声にしたときのファットボブ化、男声を女声にしたときの小人化を抑制するため、主に口の中の形状を司るとされるf1、f2のシフトを緩和させるスライダーを実装しました。
周波数に対する重みづけによる定位解析の精度向上。 ピッチシフトとフォルマントシフトを同時に使用した時の音の劣化を抑制。
（６月中旬から）広告表示インターバルを調整し、広告を減らしました。今後もユーザーが増えれば広告を減らしていきますので、宜しければアプリの拡散お願いします(笑)
ユーザー様のお声を反映してWAVでエクスポートできるようにいたしました！
フォルマントのかなり細かい設定が出来るようにしました。具体的には ・ケプストラム係数の次数周辺のフェード（スムージング）処理のオンオフ ・高音域に対する影響緩和のオンオフ ・小音量時の抑制処理のオンオフ ・高エネルギー（パーカッションやドラムを想定）での抑制度合い といった値です。特にいじらなければ一般的に無難な設定になっていますが、ちょっとデフォルトは保守的（原音を保護しすぎ）かもしれません。
微分音単位でフォルマントを修正する機能を追加。
プレビュー再生機能を追加。
フォルマントシフト処理を大幅にリニューアル。さらにケプストラム係数の自動設定機能を追加。
プリセット保存・読み込み機能を実装。日々の耳コピ練習に使いやすくなったと思います。
音声処理を堅牢化して安定性を向上。UIを改良。
アップデート。クラッシュ防止、描画の高速化、UIレイアウトの微調整を行いました。
HQモードの処理速度と音質を向上しました。
単純なピッチシフター、タイムストレッチャーに加え、フォルマントシフトやトラック分離を実装
Update History
The step size for microtonal pitch and formant correction has been changed from 5 cents to 1 cent.
We suppressed the erratic behavior of the anti-clipping function that was causing crackling sounds.
We have improved the accuracy of vocal extraction and removal.
Real-time slider updates are now supported—exclusively in Standard Mode! The formant also responds to the slider in real time!!! (This is difficult to implement in HQ Mode due to the heavy processing involved.) Minor bugs might still crop up, but I’ll address them as they arise, so please do send in your feedback!
Optimize app size and memory usage using R8 analysis.
We have significantly enhanced the phase vocoder engine in response to user feedback. We believe the graininess in HQ mode has been eliminated and the metallic noise has been substantially reduced. Thank you so much! *Note: This update currently applies only to this app. For the Flash version, we will continue working on sound quality improvements while balancing device performance constraints.
We have enhanced the formant shift function of the Pitch Tempo Changer. When the pitch is about to encroach upon the cepstrum region, the system makes an emergency adjustment, effectively signaling: "The pitch has reached this point—lower the cepstrum coefficients further!"
We’ve promoted the formant shift feature to a standard function! This allows you to adjust pitch, tempo, and formants without ads. However, ads will still appear when accessing detailed audio quality settings. I had actually planned to unlock this feature once we hit 10,000 downloads, but... well, I just went ahead and did it on impulse.
It is now possible to import video files as well.
To suppress the "Fat Bob" effect (sounding like a large, heavy-set man) when converting a female voice to a male voice, and the "munchkin" effect (sounding like a pygmy) when converting a male voice to a female voice, we implemented a slider that moderates the shifting of f1 and f2—formants primarily responsible for the shape of the oral cavity.
Improved accuracy of localization analysis through frequency weighting. Suppression of sound degradation when using pitch shift and formant shift simultaneously.
(Starting in mid-June) We adjusted the ad display interval and reduced the number of ads. We will continue to reduce ads as the number of users increases, so please spread the word about the app if you like it! (lol)
In response to user feedback, we have added the ability to export in WAV format!
We've made it possible to adjust the formant settings in much greater detail. Specifically, these include: - On/off fade (smoothing) processing around the order of the cepstrum coefficient - On/off mitigation of the effect on the high frequency range - On/off suppression processing at low volume levels - Degree of suppression at high energy (intended for percussion and drums) These are some of the values. If you don't change them, the settings are generally safe, but the default might be a little too conservative (protecting the original sound too much).
Added a function to correct formants at the microtonal level.
Implemented a preview playback function.
The formant shift processing has been significantly revamped. Furthermore, an automatic cepstrum coefficient setting function has been added.
implemented a preset save and load function. This should make it easier to use for daily ear training practice.
Enhanced audio processing for improved stability. Improved the user interface.
updated. This update includes crash prevention, faster rendering, and minor UI layout adjustments.
Improved speed and quality of HQ mode.
In addition to simple pitch shifting and time stretching, it implements formant shifting and track separation.
ユーザーレビュー・評価
very very good app
Jaime bacelis
excellent pitch shifter for mobile .A request,Please make an update so that we can shift the pitch in 1 cent micro scale .
👍🏻🙏🏻
Thank you so much. Now I can export audio in Wav format. This tool is really helpful. Love this app.
deben hacer algo para que la calidad de cambio de tono se escuche mejor porque siento que se escucha muy extraño
this app is amazing
best pitch shifter with details vocal feature... any professional music editor will like this.
La app está avanzando y mejorando, sólo que deberían mejorar a una calidad de cambio de tono más limpio, hay muchos algoritmos que dan excelentes resultados
Final, I have found my dream app. I tried other apps before but they were arrogantly doing jobs which were not even described in there given names😭. But this app only does what supposed to be done according to it's name. it's really easy, fast and affordable to use. It's features are all accurate 100% and amazing🥰. Thanks for the great job keep it up👍
Best pitch shifter app for Android even work much better than most other PC plugin.I will highly recommend everyone for use this app.This is the app which I am looking for long time ...... This app will become one of the best app for music in android..thanks developer....hope u will make another app about auto pitch correction tools(autotune) with graph mode like "melodyne". ❤️ U can change apps logo and interface design for attracting more users for downloading. Best app ever for pitch shift😊
excellent and easy results. pitch changing has never been so easy. great work dear developers.
Terrible. So many ads, it's insulting. Terrible quality. Butchers the audio as well. DO NOT WASTE YOUR TIME.
User Reviews & Ratings
Jaime bacelis
excellent pitch shifter for mobile .A request,Please make an update so that we can shift the pitch in 1 cent micro scale .
👍🏻🙏🏻
Thank you so much. Now I can export audio in Wav format. This tool is really helpful. Love this app.
deben hacer algo para que la calidad de cambio de tono se escuche mejor porque siento que se escucha muy extraño
this app is amazing
best pitch shifter with details vocal feature... any professional music editor will like this.
La app está avanzando y mejorando, sólo que deberían mejorar a una calidad de cambio de tono más limpio, hay muchos algoritmos que dan excelentes resultados
Final, I have found my dream app. I tried other apps before but they were arrogantly doing jobs which were not even described in there given names😭. But this app only does what supposed to be done according to it's name. it's really easy, fast and affordable to use. It's features are all accurate 100% and amazing🥰. Thanks for the great job keep it up👍
Best pitch shifter app for Android even work much better than most other PC plugin.I will highly recommend everyone for use this app.This is the app which I am looking for long time ...... This app will become one of the best app for music in android..thanks developer....hope u will make another app about auto pitch correction tools(autotune) with graph mode like "melodyne". ❤️ U can change apps logo and interface design for attracting more users for downloading. Best app ever for pitch shift😊
excellent and easy results. pitch changing has never been so easy. great work dear developers.
Terrible. So many ads, it's insulting. Terrible quality. Butchers the audio as well. DO NOT WASTE YOUR TIME.
very very good app
DS Soft のこだわり
既存のアプリでは手が届かないニッチな不便を、独自の技術と視点で解消します。不要な広告の削減や快適なインターフェース設計に真摯に取り組んでいます。
Our Commitment
We solve niche inconveniences that mainstream apps overlook with unique technology and perspective. We are truly committed to minimalist ads and comfortable user interface design.
今すぐ手に入れよう。
Get it now.