In step 46 of the demo walkthrough, the little popup bubble says "Viola!.". The word you're looking for there is "Voilà!" (minus the extraneous period)
Seems like an interesting project and I can see the appeal to markdown aficionados (me among them, although I don't currently have much need to do presentations)!
Seems like an interesting project and I can see the appeal to markdown aficionados (me among them, although I don't currently have much need to do presentations)!