Vocal Lab AU can identify problem areas in your singing, and can also help improve your intonation on various instruments - Violin, Brass, Woodwinds, and more.
Requires an application that supports "Cocoa" Audio Units plug-ins such as GarageBand '08 and later, Logic Pro 7.1 more...
- Fixed a bug with a stereo channel
- Now requires OS X 10.6 or later
- No longer supports PowerPC