We built something similar like this based on jQuery Impromptu and merged it together with HowlerJS. This way we have a nice website walkthrough with voice if desired.
Any chance you guys released that as open source? This is exactly what I want. Would be even better if it animated the boxes, so that the users eye is drawn to what you're showing them.
All these projects are really impressive.
Sorry we haven't yet. Let me clean it up and get back with it.