first: i am using the ML (now 11.11.11) on my 550d since a couple of month. Most of the time only for photos, but there are so many really helpfull and "never again without" features (magic zoom, HDR, time lapse….) . Thanks a lot!!!
An older version had had a LCD shortcut for the white balance what i miss now. For shooting i do not need an audio level :-) regards gogette