Adding text-to-speech functionality is one effective way to make our alphabet quiz more usable. We can achieve this courtesy of what is termed a Moodle filter, some computer code that transforms textual content that follows a particular pattern, and enhances it in some manner. Such a filter could use an external text-to-speech service, for instance Google Translate (http://translate.google.com/#en|en|Hello+world!—Look for the loudspeaker icon). Don't worry if this makes little sense yet. Our example should make things clearer.