I've added a couple of bird FX, .wav files, to data/sound/FX/mymodnamefolder and made new sound descriptors in CK and following that sound markers using the sound descriptors. I hear the sounds perfectly in CK but not in-game. What am I doing wrong?

Did you added them in your cells (yes, can be a silly question, but...)

Do you know what? I'm incredibily curious about your working any ETA?