Simultaneously play 2 audio files in separate ears.
Compare! is a program which will allow you to take two different music files (anything Quicktime can play), and will play one out one ear, and one out the other ear, in order to let the user compare the two files' quality. The user can change the balance to hear only out of one ear, only out of the other ear, or anywhere between. The purpose of the application would be to select two different encodings of a song, to find out which sounds better. Compare! costs two dollars. You can use it for 15 seconds of playback to make sure you like it first, with this demo version.