Question about differences in old & new Master Audio

What differences are there between the old and new version?  I purchased the original version of Master Audio a long time ago and honestly forgot about it, but now I am considering upgrading if I like the system, but it isn't clear what features are different because the asset store page for the original was taken down when the new version came out.

I see in the original's welcome window it links to the same API as the new version, so is it mostly the same?  How do you know if something is only in the new/old version? 

Thanks in advance.