OK, an naive question here.
If Hyperion has the right to use OS 3.1 source, why doesn't OS 4.1 have better legacy compatibility (at least as good or better than say a PC running Amiga Forever)?
I have tested quite many 68k apps and most of them run perfectly under OS4
I have to admit that I haven't tested any music apps.
There is a huge difference how UEA and Petunia handle emulation. UEA emulates whole Computer, wich means speed drop. Petunia emulates only cpu, it uses PPC native libraries etc if they are availlable, so when you start app, it is possible that only exe, runs under emulation, libraries etc are runned in native.
Some system friendly games are running under petunia, Graphics are done with native PPC drivers and sound is done with PPC native AHI. UEA emulates all of them.
When it is possible to use Petunia performance is very good, it is like no emulation at all.
With RunInUEA it possible to run whdload games etc direcly from icon.
