If you go to settings and turn off speaker, do the listening questions stop?

There is...

Yep, when the Esperanto course is released I plan to use it on the train, with my headphones on. But I don't think the other people on my train will enjoy my spoken attempts. So having a way to skip audio questions would be great.

there is an option in settings

Thanks guys, didn't realise thats what those settings actually meant. Its much better now! this program is awesome!