The following step-by-step guide shows how to use the Transposition Tool to convert an MP3 called "10 Killing me softly with his Song - MP3 Backing.mp3".
The MP3 "10 Killing me softly with his Song - MP3 Backing.mp3" is located in the Music folder.
In Safari visit the Transposition Tool page.
Click "Choose File".
In the Music folder select the MP3 "10 Killing me softly with his Song - MP3 Backing.mp3" and click "Choose".
Select the desired pitch in the "Change pitch" list.
Click "Convert" and wait for the file to be converted to the chosen pitch.
Once the conversion has completed a download link will appear. Click the "Download your converted file" link.
The converted file will appear as a download at the bottom of the screen. The converted file will have "_converted" at the end of its name to show that it is a converted version of the original.
Click on the Finder tool icon (a picture of a face) and then on "Downloads" to see the downloaded converted MP3.
If iTunes is the default player associated with MP3s then it can be played by doubleclicking on the filename "10 Killing me softly with his Song - MP3 Backing_converted.mp3". Alternatively, select the file and choose "Open With" and then choose "iTunes".
If iTunes is not visible then click the iTunes icon to make it appear. The converted file will be playing in iTunes.