First select which voice you want to use. Then type what you want it to say. To choose another voice, type in something long for example: 'pneumonoultramicroscopicsilicovolcanoconiosis' and then press enter and the spacebar straight after.
Me, The me, Le Moi and deadlykai BTW pneumonoultramicroscopicsilicovolcanoconiosis is not the longest word in the world. Tip:try typing it in where it asks you which voice to use.
