@amigadave
it maybe similar and free but people dont want it, aos4.0 is the successor and that is the whole big thing. aos4.0 cost money but it dont cost an arm or an leg either, its cheap i would say. i hope you get your curiosity satisfied by reading this threat, it have the answers to your question after all...
now back to dreaming of my bought copy of aos4.0 for the classic! :-D