Hey guys just saw this. Basically this yields a really unstable system (not to mention confusing with Direct I/O and output M/S l/R) configuring. I never had a stable system to do this on. What I did back in the day was run VST's on a seperate computer and had an autoload on both w/Midi and audio in/outs. This worked a treat. The whole draw to OS9 Logic 6.43 PT24 is not VST/VSTi it's destructive RTAS editing (premier too to a lesser extent). I use this system today, everyday.

If the goal is VST my recommend is set up a dedicated rig. Honestly there are such better softsynths now I'd do this on a modern computer (I do!). Again for me Logic 6.43/OS9 is the absolute sweet spot for destructive editing. Any computer system PC/Linux/Mac any OS and any DAW can't hold a candle to the speed and ease/joy of use on my OS9 rig for this!

Happy OS9ing!
_BT