If you're looking for a specific unlock key for Synthesia 10.8, I recommend:

The only 100% safe and legal way to unlock Synthesia 10.8 is through the . Benefits of the Official Service Key:

If you have already purchased a key but it isn't working for version 10.8:

: Synthesia provides an Automated Key Lookup tool if you have lost your code.

Advanced looping and speed controls to help you master difficult sections of a song.