What do I do if I have QuickTime installed, but nothing plays?
Check QuickTime's settings and make sure it is configured to play
MIDI files in your browser.
- Open QuickTime and go to Edit > Preferences > QuickTime Preferences.

- In the QuickTime Settings window go to the top drop-down box and choose
Browser Plug-in. If Browser Plug-in is not listed, please go here for
more information.
- In the bottom of the resulting window click on the MIME
Settings button. The other options on this screen will not effect how WolframTones uses
QuickTime.

- Find "MIDI file" under "Audio - Audio only file formats" and
check this option. If it is already checked, un-check and re-check the option.
This will cause QuickTime to re-register itself with your browser.
The other MIME types on this screen can be ignored.

- Click Apply and then OK.
- Restart your browser.
If you are using Firefox on Windows and the above instructions don't help,
you may be running into an issue with a corrupt plug-in file. Please go here for
more information.