AudioRetoucher is an music transposition tool that changes the
pitch and tempo of an audio composition. With AudioRetoucher
the sound of an instrument or voice might be modified
slightly, to make a vocalist or instrumentalist's job easier
in dealing with difficult keys, and usually involves no more
than a half-step (semitone) or possibly whole step (whole
tone) change. Vocal pitch may also be speeded up to 'smooth
out' a performance, or to make the singer sound younger. It
may be used for special effects like famous Chipmunks
recordings were created by recording vocal tracks at a slow
speed, then boosting them to normal at playback.
AudioRetoucher mainly used by musicians as MP3 key shifter,
but it also can detect BPM values for MP3 files and adjust
tempo in real time.