Howler JS 2.0 - sound is not playing on cordova, android, device

i'm trying to play sound in mobile hybrid app (cordova, ionic, howlerJS v 2), http://ift.tt/1I5DJEb

By this way:

$scope.playSelectedItem = function(index) {
            try {
                var fileName = $scope.selectedSounds[index].file;
                var filePath  = "sounds/" +fileName+".mp3";
                console.log(filePath);
                var sound = new Howl({
                    src: [filePath]
                });

                sound.play();

            } catch(e) {
                $scope.showAlert();
            }
        };

In Chrome mobile emulator everything works fine, but on device is sound not playing. I checked app permissions in manifest.xml and for sound playing is not required any special permissions.

What i'm doing wrong?

Thanks for any help.