Owen,
Pro Tools HD is a TDM system and LE is a native program. Pro Tools HD has extra cards to help your computer with the processing while Pro Tools LE doesn't. It runs strictly off the computing power of your computer. Pro Tools LE tracks can be loaded to Pro Tools HD but Pro Tools HD can't be loaded to Pro Tools LE. Pro Tools LE has no provision for smpte time code. That's about it. IMO "Pro Tolls" is ok if you're working in a huge operation that upgrades every year or two but it's an expensive proposition if you're buying a system for your own use or if your a small studio that has to justify and recoup expenses. The new 002 system looks nice though!....Fats
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