I just tried to run the "buggy" code in another function of another class, and there's no problems happens. Strange. The essential difference - previous function was static in a static class (traditional Reg). Probably the problem is somewhere on my side.
Also
Assets.getSound("Wind").play();
Works fine.
PS.Also I just updated dev HaxeFlixel. After update there appeared issues with changing alpha of sprites (changes in the tween), and with switching of their frames - in both cases sprites simply disappears from the screen. Can I roll back to the previous versions, without last changes (I'm not very familiar with git).
PPS. And the most unpleasant - returned carelessness in operation of tweens with sprites, as in version 3.3.11. For example, after changing of sprite's origins and rotation of sprite pulling returned, they weren't quite in the previous dev tweens and it was great.