Difference between Midi Track & Instrument Track better?

[paul Neathery]

I have been watching my Pro Tools Tutorial CDrom that came with my 002. the guy says to set up an Aux Track and a Midi Track to use Midi. Then I hear elsewhere, that i can use an Instrument Track for Midi. What is the difference?

Why would you use a Midi Track over an Instrument Track..and vice versa? Can you record vocals or guitar to an Instrument track or what exactly is an Instrument Track made especially for? If you can record vocals with an Inst. track, why choose that over and Audio Track?

Also, I had the idea of converting my midi tracks to audio tracks. I thought it may decrease CPU usage since the plug ins are eliminated? Am I on the right track?

thanks,
paul