1.6.1 add sound resource

before 1.6.1 I've done the following to use a custom sound:

public class ChocoCraftEventClient extends ChocoCraftEventCommon
{
    @ForgeSubscribe
    public void onSound(SoundLoadEvent event)
    {
        try
        {
            event.manager.soundPoolSounds.addSound("choco_kweh.ogg", ModChocoCraft.class.getResource(Constants.CHOCOBO_SOUND_FOLDER + "/choco_kweh.ogg"));            
        }
        catch (Exception e)
        {
            System.err.println("Failed to register one or more sounds.");
        }
    }
}

this is not working anymore, I now can only add the sound name with addSound. How do I connect the sound file with the name?