Game-breaking pitch shifting

import com.haxepunk.Sfx;
import lime.audio.openal.AL;

@:access(lime.audio.AudioSource)
@:access(lime._backend.native.NativeAudioSource)
@:access(openfl.media.SoundChannel)
class LBSfx extends Sfx
{
    public function setPitch(v:Float) : Bool
    {
        #if (html5 || js)
        return false;
        #elseif flash
        return false;
        #else
        var h = _channel.__source.backend.handle;
        // This crashes the game on Scene.update()
        // It doesn't have to be called, it just has to exist somewhere in the code (ie be compiled)
        AL.sourcef(h, AL.PITCH, v);
        return true;
        #end
    }

    public function getPitch() : Float
    {
        #if (html5 || js)
        return 1.;
        #elseif flash
        return 1.;
        #else // sys
        var h = _channel.__source.backend.handle;
        // same here
        return AL.getSourcef(h, AL.PITCH);
        #end
    }
}