Hey guys,
I appreciate this post, as I don't often find things like this written in a way that even a moron like me can understand

It answered a lot of questions, but I've still got several more ...
1. If I wanted to record 2 actual synths (not virtual instruments) at the same time on their own separate tracks, I assume then that I would need 4 analog ins and 4 digital outs, since these synths use two channels each for stereo output?
2. Assuming that the above is correct, what do I need in order to play 2 synths at the same time while singing, and have these all go on their own tracks? I'm guessing 2 analog ins + a mic input, and 6 digital outs? Not sure about the last part, as in... does an XLR input use 2 digital outs?
3. I saw one of these devices advertised as a 'six-channel audio interface' ... what exactly does that mean?
4. Assuming you have the right audio interface, do all DAWs support recording to multiple tracks at once, even the cheaper ones like Garage Band and the 'light' versions of some of the other heavy hitters? I know that some of them have a limited number of tracks, but if it advertises x number of tracks, does that implicitly mean you can record up to x number of tracks simultaneously, or is the number of simultaneous tracks supported by the DAW, different from the number of 'total' tracks?