(Information and examples taken from the DroidScript documentation)

The TextToSpeech method uses Android's speech engine to speek out loud the given text. You can specify the pitch and speed of the output with decimal values where a value of 1.0 is used for normal pitch or speed.

Note: Custom speech engines are often installed by phone manufacturers, so the quality, available pitch and speed range may vary between devices.

 app.TextToSpeech( text, pitch, speed, callback, stream, locale, engine);

function OnStart()
{
  app.TextToSpeech( "DroidScript is awesome!", 1.0, 1.0, myfunc, "music" );
} 
 
function myfunc()
{
  alert("Done reading!");
}