Don't quote me on this (haven't seen it and only pulled partial clips before answering), but I think the audio just runs as per normal. Though it'd be kind of cool to have reverse audio as an option (if in a theatre, idk, have a set up kinda like what folks do for silent discos/some bluetooth device with serious multi-connection capacity or something, and people who opt for it have one earpiece in while the vanilla track plays in the room).

Only aware of it 'cause the rep theatre here did a screening once. Seemed cool.