Mixamp Version Differences.

A forum I use is full of people (including myself) getting confused over the various iterations of the Mixamp. Is there anywhere which has a clear picture of each one (top and connectors) and the specs, eg I know it went from 5.1 DOlby to 7.1 etc so I can help clear it up for everyone? I think Astro could really do with naming new iterations a bit clearer so people actually know what they're getting Thanks in advance.