cable, or is it just that simple?!? I've never been great with electronics. Though, I used to work at Best Buy(go figure) and it seemed like for electronics, you could never just get a cable and be done with it. You had to constantly buy this kind of this, and that kind of that, and get 3 cables and put them all together...sheesh! I'm trying to buy a keyboard and am trying to be as inexpensive as possible. So tell me, I've got the mac. I just need a keyboard and an MIDI cable...right?