# Technical Information

### Supported File Formats

Capo can play songs in MP3, M4A, AIFF, and WAV formats.

iTunes Store purchases can be played in Capo, provided the song is in iTunes Plus format. Protected songs are not supported in Capo.

Note: As of January 2009, the majority of music in the iTunes Store is no longer protected by restrictive DRM, and you can convert many of the songs you already own to iTunes Plus format. See the iTunes Store for details.

### Capo includes the following licensed software

- [aufTAKT] V3 by zplane.development, for tempo and beat tracking
- [tONaRT] V2 by zplane.development, for key detection
- DIRAC Time, Stretch/Pitch Shift technology licensed from The DSP Dimension, http://www.dspdimension.com. DIRAC is (c) 2005-2011 Stephan M. Bernsee