Hi there I am rather new to the topic of stomp boxes. I intend to acquire and combine some and I think I have a general understanding of how to do that as far as sound/audio is concerned. There are a lot of descriptions on the web. I'm unsure of the power stuff (although there is a lot on the net as well). The question: The Zoom MS-70CDR (http://www.zoom.co.jp/products/ms-70cdr/spec/) requires DC9V / Center negative / 500mA. Which power distribution box does provide the necessary connector and specs? Does it necessarily need 500mA or would 400mA do? And what happens when it gets 600mA? Thanks in advance.