Well, there's a way to listen to the fonts in the UltraSabers Launcher itself even when no saber is connected. You just need to downlad the packages from
here (don't worry, they're free even when the website says $ 999.99), unzip them to a folder and then do the following:
1. Start the launcher or install it, if you haven't done that yet. Either way, give the launcher's setup.exe and UltraSabersLauncher.exe files admin rights before installing and running it (right-click -> Properties -> Compatibility -> Checkbox "Run as Administrator")!
2. Go to the tab "Obsidian sound board".
3. Open the Sound Wizard.
4. Click the small "Load" link in blue and browse to the folder where you unzipped the sound packages to.
5. Load a font, for example "Default" which is the default Obsidian font that is common to all sound boards, from Lite to v4 and the Diamond Controller.
6. Click through the different sections (Tag/Boot, Power Up etc.) on the left and then on the "Play" icon for the preview. When there is more than one file, click the file you want to listen to and then "Play" (motion and impact sometimes have more than one file).
But as Karmack said, there's no way to change the font on a Lite board, not even by the Ultrasabers staff.