But it's not good enough! I've got an AirZound, the problem is that once you have unleashed a good long blast or two at the first muppet you come across, it is more or less depleted. I want to upgrade to something that makes the same noise at the same volume level, 115dB, and yet never needs to be manually pumped up. What are the options? I have a Schmidt dynohub with an output of 6V/3W that could well come in handy.