I'm brand new to recording, and I'm thinking about getting a 424MkIII. I thought I could just read the owners' manual to understand how to work it, but I just read an entry from someone who jus found out that the "pan" is just a form of "buss," or something like that. I don't even know what those are! Also, what is trim? If some one could spare a minute to clue in a newcomer, please?