I’m technically on Mixbus nowadays but I had this same issue with Ardour 5 and it’s starting to bother me a bit. When I export as .ogg or .mp3 (tagged) all my project’s metadata prints to the export file just fine. But with .wav, this is not the case and I have to do it externally. I don’t have an export profile that is specifically labeled as “wav (tagged)”. Is there an option somewhere that I am missing? Or is this an OS problem? (I am on Ubuntu Studio 15.10).