Ok, so I've got a few pedals and been shopping around for what's next. I was thinking envelope filter or octaver or something fun and flashy but peeps keep pointing me at compressors. But I don't really get it... I've searched and read up on them. So I understand what they do. I just don't know what I'm looking for in a compressor. A friend at my last show screamed Markbass Compressore but I found a DOD Milkbox for pretty cheap. Expert opinions?