I've read a nice thread in the OS X Audio Forums about the new "Apple Loops" standard, which competes with the REX standard. It looks like it contains
- Loops like we know from REX
- A Midi version of the sounds played
- Full Sampler+Effects definitions how to recreate it
PLUS, most importantly: All this is encapsulated in a standard AIFF file which also contains a rendition of the loop ready for play.
So as a creator of loops, when you create Apple Loops, you get immediate basic compatibility to read your loops everywhere, and when used in a AL-compatible program it allows more flexibility other loops.
This is big news, indeed.
I like this flexibility, and I would like to encourage the props to include a AL-compatible Rex player in the next version of Reason.
OS X Audio Forums Thread