I don't think that a drop-in module for the 9400 is still available.

Once upon a time there were various modules available and compared on this site. Search Denon TCP and you will find the comparison that I did with regard to complexity, etc.

I have a set of code that you can customize to your own liking but requires decent amount of javascript knowledge.

If you are in the US, I'd be willing to discuss your options via telephone or via facetime. Drop me an email at the address on my RC profile.