AudioStretch

Change the speed of audio files without changing the pitch. Transpose to any key. Listen as you drag the waveform, note-by-note. Freeze play at zero speed to work out tricky chords and solos.

All in an incredibly responsive and easy-to-use app. Ideal for transcription, learning songs by ear, or just listening to your music library in a new way.

Not sure? Download AudioStretch Lite for free. It's the same as the full version apart from a few feature limitations.

FEATURES

• Simple uncluttered user interface
• LiveScrub™ : listen as you drag/hold the waveform
• Keyboard/spectrum display
• Freeze notes or chords with 0% play speed
• Wide range of play speeds: -250% to +250%
• Shift pitch by up to 12 semitones up or down
• Super-easy single-button looping feature
• Load any song in your music library*
• "Open in" support for Mail attachments and Dropbox files
• Send time-stretched, pitch-shifted files by email
• No ads or in-app purchases

*Except Fairplay DRM-protected files (i.e. very old, pre-2010 iTunes purchases). Songs stored in iCloud must be fully downloaded to the device. Files beyond 1 hour in length will be truncated to 1 hour. Songs in formats other than aac/m4a (e.g. mp3) may load a bit slowly in iOS 5.1; iOS 6 recommended.