Audio Delay

Would it be possible to add a feature to add audio delay to a video file like it is possible to add subtitle delay?

Or is this already possible?

I had the same problem using Airport Express with APTV4. Decided to replace it with Logitech bluetooth reciever. No lag everything works flawlessly plus it freed up some of the wifi traffic! With iphone and ipd I use aptv for aireplay. Works great. Tv doesn’t have to be on!