to my knowledge you need to explicitely force 10.6 _and_ logic 9.1 to run in 64bit mode
Vienna Ensemble PRO and Vienna Suite is 64bit, VE (the free one) will probably not be updated, the legacy performance tool will for sure not be updated (as apple indicates the interface is no longer supported).
with VI ... has someone already tried to insert the 32bit VI into logic running in 64bit mode?
i would expect some kind of bit-bridging, otherwise all 32bit plugins (which are almost all) couldn't be used any longer ...
christian
and remember: only a CRAY can run an endless loop in just three seconds.