Sounds don't play

I’m trying to convert my XNA game to MonoGame, one of the problems I’m having is that sounds don’t play. There’s no error message or exception, but nothing happens when I play them.

If I make a small test project with nothing in it, except code to play one of these sounds, it works. So it can’t be something wrong with my PC.

Anyone encountered this, or have any suggestions for debugging it?