Audition CS5.5 was the first version that was cross-platform (PC/MAC). As a result, it was very much a "work in progress" and a number of features present in the prior version 3.01 did not make it into 5.5. CS6 was the next version (and a considerable "upgrade") and, as you say, the current CC version is at 10.1.1.11. I don't still have 5.5 installed but I do have 6 and the differences between it and the latest CC are pretty dramatic. I can't even begin to list those differences (because I'm not a power-user and many of them may not be directly evident to me) but I'm sure if SteveG or ryclark sees this thread they may well be able to offer you some guidance. So, can you "learn" on the latest CC and apply your knowledge to 5.5? Theoretically yes, but I suspect you would quickly find that something you can do in CC is just not possible in 5.5, even ignoring the fact that the latest versions are 64 bit only and 5.5 was 32 bit (only), I think! Edit: as to a demo version of 5.5, almost certainly impossible.
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