FrenchSpanishOnline has a voice synthesizer feature which is helpful for my students. It is not perfect but it means a student can be more independent when they learn to use tools like this. In a big class or if students miss lessons for whatever reason, a voice synthesizer can be very helpful. There is a little bit of a delay on this one on my MacBook and the words vanish from the box when they are going to be pronounced. My younger students thought this would be a good way to manage my classes if I lost my voice!